diff --git a/plugins/python-build/share/python-build/patches/3.12.0/Python-3.12.0/0002-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch b/plugins/python-build/share/python-build/patches/3.12.0/Python-3.12.0/0002-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
new file mode 100644
index 00000000..da0fc05e
--- /dev/null
+++ b/plugins/python-build/share/python-build/patches/3.12.0/Python-3.12.0/0002-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
@@ -0,0 +1,119 @@
+From ac12d63bf188f9497f8453c0447b9bc599acbf22 Mon Sep 17 00:00:00 2001
+From: Ned Deily <nad@python.org>
+Date: Wed, 5 Aug 2026 10:30:17 +0300
+Subject: [PATCH] (downstream) [3.12] gh-153711: Avoid use of dup3 and pipe2
+ calls introduced in macOS 27 (#155211)
+
+---
+ ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
+ configure                                     | 33 +++++++++++--------
+ configure.ac                                  | 11 +++++--
+ 3 files changed, 32 insertions(+), 15 deletions(-)
+ create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+
+diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+new file mode 100644
+index 00000000000..90804c179a4
+--- /dev/null
++++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+@@ -0,0 +1,3 @@
++On macOS, do not attempt to use the :manpage:`dup3(2)` and
++:manpage:`pipe2(2)` system calls introduced in
++macOS 27 to prevent problems when running on older systems.
+diff --git a/configure b/configure
+index b6f90bcd8c7..b93aab935ce 100755
+--- a/configure
++++ b/configure
+@@ -17552,13 +17552,7 @@ fi
+ ac_fn_c_check_func "$LINENO" "dup" "ac_cv_func_dup"
+ if test "x$ac_cv_func_dup" = xyes
+ then :
+-  printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
+-
+-fi
+-ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
+-if test "x$ac_cv_func_dup3" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
++  printf '%s\n' "#define HAVE_DUP 1" >>confdefs.h
+ 
+ fi
+ ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
+@@ -18028,12 +18022,6 @@ if test "x$ac_cv_func_pipe" = xyes
+ then :
+   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
+ 
+-fi
+-ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
+-if test "x$ac_cv_func_pipe2" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
+-
+ fi
+ ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
+ if test "x$ac_cv_func_plock" = xyes
+@@ -18608,6 +18596,25 @@ fi
+ 
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
++if test "x$ac_cv_func_dup3" = xyes
++then :
++  printf '%s\n' "#define HAVE_DUP3 1" >>confdefs.h
++
++fi
++ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
++if test "x$ac_cv_func_pipe2" = xyes
++then :
++  printf '%s\n' "#define HAVE_PIPE2 1" >>confdefs.h
++
++fi
++
++fi
++
+ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
+ printf %s "checking for $CC options needed to detect all undeclared functions... " >&6; }
+ if test ${ac_cv_c_undeclared_builtin_options+y}
+diff --git a/configure.ac b/configure.ac
+index ba768aea930..92049fb2889 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -4860,7 +4860,7 @@ fi
+ # checks for library functions
+ AC_CHECK_FUNCS([ \
+   accept4 alarm bind_textdomain_codeset chmod chown clock close_range confstr \
+-  copy_file_range ctermid dup dup3 execv explicit_bzero explicit_memset \
++  copy_file_range ctermid dup execv explicit_bzero explicit_memset \
+   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
+   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
+   gai_strerror getegid getentropy geteuid getgid getgrgid getgrgid_r \
+@@ -4870,7 +4870,7 @@ AC_CHECK_FUNCS([ \
+   getspnam getuid getwd if_nameindex initgroups kill killpg lchown linkat \
+   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
+   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
+-  pipe2 plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
++  plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
+   pread preadv preadv2 pthread_condattr_setclock pthread_init pthread_kill \
+   pwrite pwritev pwritev2 readlink readlinkat readv realpath renameat \
+   rtpSpawn sched_get_priority_max sched_rr_get_interval sched_setaffinity \
+@@ -4892,6 +4892,13 @@ if test "$MACHDEP" != linux; then
+   AC_CHECK_FUNCS([lchmod])
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  AC_CHECK_FUNCS([dup3 pipe2])
++fi
++
+ AC_CHECK_DECL([dirfd],
+               [AC_DEFINE([HAVE_DIRFD], [1],
+                          [Define if you have the 'dirfd' function or macro.])],
+-- 
+2.55.0.windows.3
+
diff --git a/plugins/python-build/share/python-build/patches/3.12.1/Python-3.12.1/0002-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch b/plugins/python-build/share/python-build/patches/3.12.1/Python-3.12.1/0002-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
new file mode 100644
index 00000000..f79533a0
--- /dev/null
+++ b/plugins/python-build/share/python-build/patches/3.12.1/Python-3.12.1/0002-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
@@ -0,0 +1,119 @@
+From a4b6c2946c6be5b732a3a3d30b8ac75673bc71e6 Mon Sep 17 00:00:00 2001
+From: Ned Deily <nad@python.org>
+Date: Wed, 5 Aug 2026 10:30:17 +0300
+Subject: [PATCH] (downstream) [3.12] gh-153711: Avoid use of dup3 and pipe2
+ calls introduced in macOS 27 (#155211)
+
+---
+ ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
+ configure                                     | 33 +++++++++++--------
+ configure.ac                                  | 11 +++++--
+ 3 files changed, 32 insertions(+), 15 deletions(-)
+ create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+
+diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+new file mode 100644
+index 00000000000..90804c179a4
+--- /dev/null
++++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+@@ -0,0 +1,3 @@
++On macOS, do not attempt to use the :manpage:`dup3(2)` and
++:manpage:`pipe2(2)` system calls introduced in
++macOS 27 to prevent problems when running on older systems.
+diff --git a/configure b/configure
+index 99dd1fe5958..52c4790ac74 100755
+--- a/configure
++++ b/configure
+@@ -17566,13 +17566,7 @@ fi
+ ac_fn_c_check_func "$LINENO" "dup" "ac_cv_func_dup"
+ if test "x$ac_cv_func_dup" = xyes
+ then :
+-  printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
+-
+-fi
+-ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
+-if test "x$ac_cv_func_dup3" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
++  printf '%s\n' "#define HAVE_DUP 1" >>confdefs.h
+ 
+ fi
+ ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
+@@ -18042,12 +18036,6 @@ if test "x$ac_cv_func_pipe" = xyes
+ then :
+   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
+ 
+-fi
+-ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
+-if test "x$ac_cv_func_pipe2" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
+-
+ fi
+ ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
+ if test "x$ac_cv_func_plock" = xyes
+@@ -18622,6 +18610,25 @@ fi
+ 
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
++if test "x$ac_cv_func_dup3" = xyes
++then :
++  printf '%s\n' "#define HAVE_DUP3 1" >>confdefs.h
++
++fi
++ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
++if test "x$ac_cv_func_pipe2" = xyes
++then :
++  printf '%s\n' "#define HAVE_PIPE2 1" >>confdefs.h
++
++fi
++
++fi
++
+ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
+ printf %s "checking for $CC options needed to detect all undeclared functions... " >&6; }
+ if test ${ac_cv_c_undeclared_builtin_options+y}
+diff --git a/configure.ac b/configure.ac
+index bd2be94b47c..45212bd6040 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -4870,7 +4870,7 @@ fi
+ # checks for library functions
+ AC_CHECK_FUNCS([ \
+   accept4 alarm bind_textdomain_codeset chmod chown clock close_range confstr \
+-  copy_file_range ctermid dup dup3 execv explicit_bzero explicit_memset \
++  copy_file_range ctermid dup execv explicit_bzero explicit_memset \
+   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
+   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
+   gai_strerror getegid getentropy geteuid getgid getgrgid getgrgid_r \
+@@ -4880,7 +4880,7 @@ AC_CHECK_FUNCS([ \
+   getspnam getuid getwd if_nameindex initgroups kill killpg lchown linkat \
+   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
+   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
+-  pipe2 plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
++  plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
+   pread preadv preadv2 pthread_condattr_setclock pthread_init pthread_kill \
+   pwrite pwritev pwritev2 readlink readlinkat readv realpath renameat \
+   rtpSpawn sched_get_priority_max sched_rr_get_interval sched_setaffinity \
+@@ -4902,6 +4902,13 @@ if test "$MACHDEP" != linux; then
+   AC_CHECK_FUNCS([lchmod])
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  AC_CHECK_FUNCS([dup3 pipe2])
++fi
++
+ AC_CHECK_DECL([dirfd],
+               [AC_DEFINE([HAVE_DIRFD], [1],
+                          [Define if you have the 'dirfd' function or macro.])],
+-- 
+2.55.0.windows.3
+
diff --git a/plugins/python-build/share/python-build/patches/3.12.10/Python-3.12.10/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch b/plugins/python-build/share/python-build/patches/3.12.10/Python-3.12.10/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
new file mode 100644
index 00000000..85018374
--- /dev/null
+++ b/plugins/python-build/share/python-build/patches/3.12.10/Python-3.12.10/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
@@ -0,0 +1,119 @@
+From 0e76b1b0219d61d389ddc4516fceb339608c6bf5 Mon Sep 17 00:00:00 2001
+From: Ned Deily <nad@python.org>
+Date: Wed, 5 Aug 2026 10:30:17 +0300
+Subject: [PATCH] (downstream) [3.12] gh-153711: Avoid use of dup3 and pipe2
+ calls introduced in macOS 27 (#155211)
+
+---
+ ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
+ configure                                     | 33 +++++++++++--------
+ configure.ac                                  | 11 +++++--
+ 3 files changed, 32 insertions(+), 15 deletions(-)
+ create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+
+diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+new file mode 100644
+index 00000000000..90804c179a4
+--- /dev/null
++++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+@@ -0,0 +1,3 @@
++On macOS, do not attempt to use the :manpage:`dup3(2)` and
++:manpage:`pipe2(2)` system calls introduced in
++macOS 27 to prevent problems when running on older systems.
+diff --git a/configure b/configure
+index 89edc42f45c..e099c5ad55a 100755
+--- a/configure
++++ b/configure
+@@ -17614,13 +17614,7 @@ fi
+ ac_fn_c_check_func "$LINENO" "dup" "ac_cv_func_dup"
+ if test "x$ac_cv_func_dup" = xyes
+ then :
+-  printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
+-
+-fi
+-ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
+-if test "x$ac_cv_func_dup3" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
++  printf '%s\n' "#define HAVE_DUP 1" >>confdefs.h
+ 
+ fi
+ ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
+@@ -18090,12 +18084,6 @@ if test "x$ac_cv_func_pipe" = xyes
+ then :
+   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
+ 
+-fi
+-ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
+-if test "x$ac_cv_func_pipe2" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
+-
+ fi
+ ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
+ if test "x$ac_cv_func_plock" = xyes
+@@ -18670,6 +18658,25 @@ fi
+ 
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
++if test "x$ac_cv_func_dup3" = xyes
++then :
++  printf '%s\n' "#define HAVE_DUP3 1" >>confdefs.h
++
++fi
++ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
++if test "x$ac_cv_func_pipe2" = xyes
++then :
++  printf '%s\n' "#define HAVE_PIPE2 1" >>confdefs.h
++
++fi
++
++fi
++
+ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
+ printf %s "checking for $CC options needed to detect all undeclared functions... " >&6; }
+ if test ${ac_cv_c_undeclared_builtin_options+y}
+diff --git a/configure.ac b/configure.ac
+index 1a02d19f1b2..f2b58421d74 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -4920,7 +4920,7 @@ fi
+ # checks for library functions
+ AC_CHECK_FUNCS([ \
+   accept4 alarm bind_textdomain_codeset chmod chown clock close_range confstr \
+-  copy_file_range ctermid dup dup3 execv explicit_bzero explicit_memset \
++  copy_file_range ctermid dup execv explicit_bzero explicit_memset \
+   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
+   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
+   gai_strerror getegid getentropy geteuid getgid getgrgid getgrgid_r \
+@@ -4930,7 +4930,7 @@ AC_CHECK_FUNCS([ \
+   getspnam getuid getwd if_nameindex initgroups kill killpg lchown linkat \
+   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
+   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
+-  pipe2 plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
++  plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
+   pread preadv preadv2 pthread_condattr_setclock pthread_init pthread_kill \
+   pwrite pwritev pwritev2 readlink readlinkat readv realpath renameat \
+   rtpSpawn sched_get_priority_max sched_rr_get_interval sched_setaffinity \
+@@ -4952,6 +4952,13 @@ if test "$MACHDEP" != linux; then
+   AC_CHECK_FUNCS([lchmod])
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  AC_CHECK_FUNCS([dup3 pipe2])
++fi
++
+ AC_CHECK_DECL([dirfd],
+               [AC_DEFINE([HAVE_DIRFD], [1],
+                          [Define if you have the 'dirfd' function or macro.])],
+-- 
+2.55.0.windows.3
+
diff --git a/plugins/python-build/share/python-build/patches/3.12.11/Python-3.12.11/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch b/plugins/python-build/share/python-build/patches/3.12.11/Python-3.12.11/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
new file mode 100644
index 00000000..d4303100
--- /dev/null
+++ b/plugins/python-build/share/python-build/patches/3.12.11/Python-3.12.11/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
@@ -0,0 +1,119 @@
+From a4720333372f8d13138101cf9d51033eacf1d422 Mon Sep 17 00:00:00 2001
+From: Ned Deily <nad@python.org>
+Date: Wed, 5 Aug 2026 10:30:17 +0300
+Subject: [PATCH] (downstream) [3.12] gh-153711: Avoid use of dup3 and pipe2
+ calls introduced in macOS 27 (#155211)
+
+---
+ ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
+ configure                                     | 33 +++++++++++--------
+ configure.ac                                  | 11 +++++--
+ 3 files changed, 32 insertions(+), 15 deletions(-)
+ create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+
+diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+new file mode 100644
+index 00000000000..90804c179a4
+--- /dev/null
++++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+@@ -0,0 +1,3 @@
++On macOS, do not attempt to use the :manpage:`dup3(2)` and
++:manpage:`pipe2(2)` system calls introduced in
++macOS 27 to prevent problems when running on older systems.
+diff --git a/configure b/configure
+index 89edc42f45c..e099c5ad55a 100755
+--- a/configure
++++ b/configure
+@@ -17614,13 +17614,7 @@ fi
+ ac_fn_c_check_func "$LINENO" "dup" "ac_cv_func_dup"
+ if test "x$ac_cv_func_dup" = xyes
+ then :
+-  printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
+-
+-fi
+-ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
+-if test "x$ac_cv_func_dup3" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
++  printf '%s\n' "#define HAVE_DUP 1" >>confdefs.h
+ 
+ fi
+ ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
+@@ -18090,12 +18084,6 @@ if test "x$ac_cv_func_pipe" = xyes
+ then :
+   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
+ 
+-fi
+-ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
+-if test "x$ac_cv_func_pipe2" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
+-
+ fi
+ ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
+ if test "x$ac_cv_func_plock" = xyes
+@@ -18670,6 +18658,25 @@ fi
+ 
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
++if test "x$ac_cv_func_dup3" = xyes
++then :
++  printf '%s\n' "#define HAVE_DUP3 1" >>confdefs.h
++
++fi
++ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
++if test "x$ac_cv_func_pipe2" = xyes
++then :
++  printf '%s\n' "#define HAVE_PIPE2 1" >>confdefs.h
++
++fi
++
++fi
++
+ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
+ printf %s "checking for $CC options needed to detect all undeclared functions... " >&6; }
+ if test ${ac_cv_c_undeclared_builtin_options+y}
+diff --git a/configure.ac b/configure.ac
+index 1a02d19f1b2..f2b58421d74 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -4920,7 +4920,7 @@ fi
+ # checks for library functions
+ AC_CHECK_FUNCS([ \
+   accept4 alarm bind_textdomain_codeset chmod chown clock close_range confstr \
+-  copy_file_range ctermid dup dup3 execv explicit_bzero explicit_memset \
++  copy_file_range ctermid dup execv explicit_bzero explicit_memset \
+   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
+   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
+   gai_strerror getegid getentropy geteuid getgid getgrgid getgrgid_r \
+@@ -4930,7 +4930,7 @@ AC_CHECK_FUNCS([ \
+   getspnam getuid getwd if_nameindex initgroups kill killpg lchown linkat \
+   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
+   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
+-  pipe2 plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
++  plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
+   pread preadv preadv2 pthread_condattr_setclock pthread_init pthread_kill \
+   pwrite pwritev pwritev2 readlink readlinkat readv realpath renameat \
+   rtpSpawn sched_get_priority_max sched_rr_get_interval sched_setaffinity \
+@@ -4952,6 +4952,13 @@ if test "$MACHDEP" != linux; then
+   AC_CHECK_FUNCS([lchmod])
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  AC_CHECK_FUNCS([dup3 pipe2])
++fi
++
+ AC_CHECK_DECL([dirfd],
+               [AC_DEFINE([HAVE_DIRFD], [1],
+                          [Define if you have the 'dirfd' function or macro.])],
+-- 
+2.55.0.windows.3
+
diff --git a/plugins/python-build/share/python-build/patches/3.12.12/Python-3.12.12/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch b/plugins/python-build/share/python-build/patches/3.12.12/Python-3.12.12/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
new file mode 100644
index 00000000..8ed420ca
--- /dev/null
+++ b/plugins/python-build/share/python-build/patches/3.12.12/Python-3.12.12/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
@@ -0,0 +1,119 @@
+From 9bd15ba319eb324b12a6ecf43a4b30c5fcdcdc83 Mon Sep 17 00:00:00 2001
+From: Ned Deily <nad@python.org>
+Date: Wed, 5 Aug 2026 10:30:17 +0300
+Subject: [PATCH] (downstream) [3.12] gh-153711: Avoid use of dup3 and pipe2
+ calls introduced in macOS 27 (#155211)
+
+---
+ ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
+ configure                                     | 33 +++++++++++--------
+ configure.ac                                  | 11 +++++--
+ 3 files changed, 32 insertions(+), 15 deletions(-)
+ create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+
+diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+new file mode 100644
+index 00000000000..90804c179a4
+--- /dev/null
++++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+@@ -0,0 +1,3 @@
++On macOS, do not attempt to use the :manpage:`dup3(2)` and
++:manpage:`pipe2(2)` system calls introduced in
++macOS 27 to prevent problems when running on older systems.
+diff --git a/configure b/configure
+index 89edc42f45c..e099c5ad55a 100755
+--- a/configure
++++ b/configure
+@@ -17614,13 +17614,7 @@ fi
+ ac_fn_c_check_func "$LINENO" "dup" "ac_cv_func_dup"
+ if test "x$ac_cv_func_dup" = xyes
+ then :
+-  printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
+-
+-fi
+-ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
+-if test "x$ac_cv_func_dup3" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
++  printf '%s\n' "#define HAVE_DUP 1" >>confdefs.h
+ 
+ fi
+ ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
+@@ -18090,12 +18084,6 @@ if test "x$ac_cv_func_pipe" = xyes
+ then :
+   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
+ 
+-fi
+-ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
+-if test "x$ac_cv_func_pipe2" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
+-
+ fi
+ ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
+ if test "x$ac_cv_func_plock" = xyes
+@@ -18670,6 +18658,25 @@ fi
+ 
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
++if test "x$ac_cv_func_dup3" = xyes
++then :
++  printf '%s\n' "#define HAVE_DUP3 1" >>confdefs.h
++
++fi
++ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
++if test "x$ac_cv_func_pipe2" = xyes
++then :
++  printf '%s\n' "#define HAVE_PIPE2 1" >>confdefs.h
++
++fi
++
++fi
++
+ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
+ printf %s "checking for $CC options needed to detect all undeclared functions... " >&6; }
+ if test ${ac_cv_c_undeclared_builtin_options+y}
+diff --git a/configure.ac b/configure.ac
+index 1a02d19f1b2..f2b58421d74 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -4920,7 +4920,7 @@ fi
+ # checks for library functions
+ AC_CHECK_FUNCS([ \
+   accept4 alarm bind_textdomain_codeset chmod chown clock close_range confstr \
+-  copy_file_range ctermid dup dup3 execv explicit_bzero explicit_memset \
++  copy_file_range ctermid dup execv explicit_bzero explicit_memset \
+   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
+   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
+   gai_strerror getegid getentropy geteuid getgid getgrgid getgrgid_r \
+@@ -4930,7 +4930,7 @@ AC_CHECK_FUNCS([ \
+   getspnam getuid getwd if_nameindex initgroups kill killpg lchown linkat \
+   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
+   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
+-  pipe2 plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
++  plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
+   pread preadv preadv2 pthread_condattr_setclock pthread_init pthread_kill \
+   pwrite pwritev pwritev2 readlink readlinkat readv realpath renameat \
+   rtpSpawn sched_get_priority_max sched_rr_get_interval sched_setaffinity \
+@@ -4952,6 +4952,13 @@ if test "$MACHDEP" != linux; then
+   AC_CHECK_FUNCS([lchmod])
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  AC_CHECK_FUNCS([dup3 pipe2])
++fi
++
+ AC_CHECK_DECL([dirfd],
+               [AC_DEFINE([HAVE_DIRFD], [1],
+                          [Define if you have the 'dirfd' function or macro.])],
+-- 
+2.55.0.windows.3
+
diff --git a/plugins/python-build/share/python-build/patches/3.12.13/Python-3.12.13/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch b/plugins/python-build/share/python-build/patches/3.12.13/Python-3.12.13/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
new file mode 100644
index 00000000..5736977f
--- /dev/null
+++ b/plugins/python-build/share/python-build/patches/3.12.13/Python-3.12.13/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
@@ -0,0 +1,119 @@
+From 4cfd78f7b5128da5ca9628de77feec4b768c2531 Mon Sep 17 00:00:00 2001
+From: Ned Deily <nad@python.org>
+Date: Wed, 5 Aug 2026 10:30:17 +0300
+Subject: [PATCH] (downstream) [3.12] gh-153711: Avoid use of dup3 and pipe2
+ calls introduced in macOS 27 (#155211)
+
+---
+ ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
+ configure                                     | 33 +++++++++++--------
+ configure.ac                                  | 11 +++++--
+ 3 files changed, 32 insertions(+), 15 deletions(-)
+ create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+
+diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+new file mode 100644
+index 00000000000..90804c179a4
+--- /dev/null
++++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+@@ -0,0 +1,3 @@
++On macOS, do not attempt to use the :manpage:`dup3(2)` and
++:manpage:`pipe2(2)` system calls introduced in
++macOS 27 to prevent problems when running on older systems.
+diff --git a/configure b/configure
+index 89edc42f45c..e099c5ad55a 100755
+--- a/configure
++++ b/configure
+@@ -17614,13 +17614,7 @@ fi
+ ac_fn_c_check_func "$LINENO" "dup" "ac_cv_func_dup"
+ if test "x$ac_cv_func_dup" = xyes
+ then :
+-  printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
+-
+-fi
+-ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
+-if test "x$ac_cv_func_dup3" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
++  printf '%s\n' "#define HAVE_DUP 1" >>confdefs.h
+ 
+ fi
+ ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
+@@ -18090,12 +18084,6 @@ if test "x$ac_cv_func_pipe" = xyes
+ then :
+   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
+ 
+-fi
+-ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
+-if test "x$ac_cv_func_pipe2" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
+-
+ fi
+ ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
+ if test "x$ac_cv_func_plock" = xyes
+@@ -18670,6 +18658,25 @@ fi
+ 
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
++if test "x$ac_cv_func_dup3" = xyes
++then :
++  printf '%s\n' "#define HAVE_DUP3 1" >>confdefs.h
++
++fi
++ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
++if test "x$ac_cv_func_pipe2" = xyes
++then :
++  printf '%s\n' "#define HAVE_PIPE2 1" >>confdefs.h
++
++fi
++
++fi
++
+ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
+ printf %s "checking for $CC options needed to detect all undeclared functions... " >&6; }
+ if test ${ac_cv_c_undeclared_builtin_options+y}
+diff --git a/configure.ac b/configure.ac
+index 1a02d19f1b2..f2b58421d74 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -4920,7 +4920,7 @@ fi
+ # checks for library functions
+ AC_CHECK_FUNCS([ \
+   accept4 alarm bind_textdomain_codeset chmod chown clock close_range confstr \
+-  copy_file_range ctermid dup dup3 execv explicit_bzero explicit_memset \
++  copy_file_range ctermid dup execv explicit_bzero explicit_memset \
+   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
+   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
+   gai_strerror getegid getentropy geteuid getgid getgrgid getgrgid_r \
+@@ -4930,7 +4930,7 @@ AC_CHECK_FUNCS([ \
+   getspnam getuid getwd if_nameindex initgroups kill killpg lchown linkat \
+   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
+   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
+-  pipe2 plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
++  plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
+   pread preadv preadv2 pthread_condattr_setclock pthread_init pthread_kill \
+   pwrite pwritev pwritev2 readlink readlinkat readv realpath renameat \
+   rtpSpawn sched_get_priority_max sched_rr_get_interval sched_setaffinity \
+@@ -4952,6 +4952,13 @@ if test "$MACHDEP" != linux; then
+   AC_CHECK_FUNCS([lchmod])
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  AC_CHECK_FUNCS([dup3 pipe2])
++fi
++
+ AC_CHECK_DECL([dirfd],
+               [AC_DEFINE([HAVE_DIRFD], [1],
+                          [Define if you have the 'dirfd' function or macro.])],
+-- 
+2.55.0.windows.3
+
diff --git a/plugins/python-build/share/python-build/patches/3.12.14/Python-3.12.14/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch b/plugins/python-build/share/python-build/patches/3.12.14/Python-3.12.14/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
new file mode 100644
index 00000000..da0fc05e
--- /dev/null
+++ b/plugins/python-build/share/python-build/patches/3.12.14/Python-3.12.14/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
@@ -0,0 +1,119 @@
+From ac12d63bf188f9497f8453c0447b9bc599acbf22 Mon Sep 17 00:00:00 2001
+From: Ned Deily <nad@python.org>
+Date: Wed, 5 Aug 2026 10:30:17 +0300
+Subject: [PATCH] (downstream) [3.12] gh-153711: Avoid use of dup3 and pipe2
+ calls introduced in macOS 27 (#155211)
+
+---
+ ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
+ configure                                     | 33 +++++++++++--------
+ configure.ac                                  | 11 +++++--
+ 3 files changed, 32 insertions(+), 15 deletions(-)
+ create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+
+diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+new file mode 100644
+index 00000000000..90804c179a4
+--- /dev/null
++++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+@@ -0,0 +1,3 @@
++On macOS, do not attempt to use the :manpage:`dup3(2)` and
++:manpage:`pipe2(2)` system calls introduced in
++macOS 27 to prevent problems when running on older systems.
+diff --git a/configure b/configure
+index b6f90bcd8c7..b93aab935ce 100755
+--- a/configure
++++ b/configure
+@@ -17552,13 +17552,7 @@ fi
+ ac_fn_c_check_func "$LINENO" "dup" "ac_cv_func_dup"
+ if test "x$ac_cv_func_dup" = xyes
+ then :
+-  printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
+-
+-fi
+-ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
+-if test "x$ac_cv_func_dup3" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
++  printf '%s\n' "#define HAVE_DUP 1" >>confdefs.h
+ 
+ fi
+ ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
+@@ -18028,12 +18022,6 @@ if test "x$ac_cv_func_pipe" = xyes
+ then :
+   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
+ 
+-fi
+-ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
+-if test "x$ac_cv_func_pipe2" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
+-
+ fi
+ ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
+ if test "x$ac_cv_func_plock" = xyes
+@@ -18608,6 +18596,25 @@ fi
+ 
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
++if test "x$ac_cv_func_dup3" = xyes
++then :
++  printf '%s\n' "#define HAVE_DUP3 1" >>confdefs.h
++
++fi
++ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
++if test "x$ac_cv_func_pipe2" = xyes
++then :
++  printf '%s\n' "#define HAVE_PIPE2 1" >>confdefs.h
++
++fi
++
++fi
++
+ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
+ printf %s "checking for $CC options needed to detect all undeclared functions... " >&6; }
+ if test ${ac_cv_c_undeclared_builtin_options+y}
+diff --git a/configure.ac b/configure.ac
+index ba768aea930..92049fb2889 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -4860,7 +4860,7 @@ fi
+ # checks for library functions
+ AC_CHECK_FUNCS([ \
+   accept4 alarm bind_textdomain_codeset chmod chown clock close_range confstr \
+-  copy_file_range ctermid dup dup3 execv explicit_bzero explicit_memset \
++  copy_file_range ctermid dup execv explicit_bzero explicit_memset \
+   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
+   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
+   gai_strerror getegid getentropy geteuid getgid getgrgid getgrgid_r \
+@@ -4870,7 +4870,7 @@ AC_CHECK_FUNCS([ \
+   getspnam getuid getwd if_nameindex initgroups kill killpg lchown linkat \
+   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
+   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
+-  pipe2 plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
++  plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
+   pread preadv preadv2 pthread_condattr_setclock pthread_init pthread_kill \
+   pwrite pwritev pwritev2 readlink readlinkat readv realpath renameat \
+   rtpSpawn sched_get_priority_max sched_rr_get_interval sched_setaffinity \
+@@ -4892,6 +4892,13 @@ if test "$MACHDEP" != linux; then
+   AC_CHECK_FUNCS([lchmod])
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  AC_CHECK_FUNCS([dup3 pipe2])
++fi
++
+ AC_CHECK_DECL([dirfd],
+               [AC_DEFINE([HAVE_DIRFD], [1],
+                          [Define if you have the 'dirfd' function or macro.])],
+-- 
+2.55.0.windows.3
+
diff --git a/plugins/python-build/share/python-build/patches/3.12.2/Python-3.12.2/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch b/plugins/python-build/share/python-build/patches/3.12.2/Python-3.12.2/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
new file mode 100644
index 00000000..3788d406
--- /dev/null
+++ b/plugins/python-build/share/python-build/patches/3.12.2/Python-3.12.2/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
@@ -0,0 +1,119 @@
+From 2b0563ccd3da13eba12ceb53cfca3792df7bec44 Mon Sep 17 00:00:00 2001
+From: Ned Deily <nad@python.org>
+Date: Wed, 5 Aug 2026 10:30:17 +0300
+Subject: [PATCH] (downstream) [3.12] gh-153711: Avoid use of dup3 and pipe2
+ calls introduced in macOS 27 (#155211)
+
+---
+ ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
+ configure                                     | 33 +++++++++++--------
+ configure.ac                                  | 11 +++++--
+ 3 files changed, 32 insertions(+), 15 deletions(-)
+ create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+
+diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+new file mode 100644
+index 00000000000..90804c179a4
+--- /dev/null
++++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+@@ -0,0 +1,3 @@
++On macOS, do not attempt to use the :manpage:`dup3(2)` and
++:manpage:`pipe2(2)` system calls introduced in
++macOS 27 to prevent problems when running on older systems.
+diff --git a/configure b/configure
+index e962a6aed12..7a7e3204ea9 100755
+--- a/configure
++++ b/configure
+@@ -17566,13 +17566,7 @@ fi
+ ac_fn_c_check_func "$LINENO" "dup" "ac_cv_func_dup"
+ if test "x$ac_cv_func_dup" = xyes
+ then :
+-  printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
+-
+-fi
+-ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
+-if test "x$ac_cv_func_dup3" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
++  printf '%s\n' "#define HAVE_DUP 1" >>confdefs.h
+ 
+ fi
+ ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
+@@ -18042,12 +18036,6 @@ if test "x$ac_cv_func_pipe" = xyes
+ then :
+   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
+ 
+-fi
+-ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
+-if test "x$ac_cv_func_pipe2" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
+-
+ fi
+ ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
+ if test "x$ac_cv_func_plock" = xyes
+@@ -18622,6 +18610,25 @@ fi
+ 
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
++if test "x$ac_cv_func_dup3" = xyes
++then :
++  printf '%s\n' "#define HAVE_DUP3 1" >>confdefs.h
++
++fi
++ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
++if test "x$ac_cv_func_pipe2" = xyes
++then :
++  printf '%s\n' "#define HAVE_PIPE2 1" >>confdefs.h
++
++fi
++
++fi
++
+ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
+ printf %s "checking for $CC options needed to detect all undeclared functions... " >&6; }
+ if test ${ac_cv_c_undeclared_builtin_options+y}
+diff --git a/configure.ac b/configure.ac
+index 384718db1f0..7f117003df7 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -4870,7 +4870,7 @@ fi
+ # checks for library functions
+ AC_CHECK_FUNCS([ \
+   accept4 alarm bind_textdomain_codeset chmod chown clock close_range confstr \
+-  copy_file_range ctermid dup dup3 execv explicit_bzero explicit_memset \
++  copy_file_range ctermid dup execv explicit_bzero explicit_memset \
+   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
+   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
+   gai_strerror getegid getentropy geteuid getgid getgrgid getgrgid_r \
+@@ -4880,7 +4880,7 @@ AC_CHECK_FUNCS([ \
+   getspnam getuid getwd if_nameindex initgroups kill killpg lchown linkat \
+   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
+   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
+-  pipe2 plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
++  plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
+   pread preadv preadv2 pthread_condattr_setclock pthread_init pthread_kill \
+   pwrite pwritev pwritev2 readlink readlinkat readv realpath renameat \
+   rtpSpawn sched_get_priority_max sched_rr_get_interval sched_setaffinity \
+@@ -4902,6 +4902,13 @@ if test "$MACHDEP" != linux; then
+   AC_CHECK_FUNCS([lchmod])
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  AC_CHECK_FUNCS([dup3 pipe2])
++fi
++
+ AC_CHECK_DECL([dirfd],
+               [AC_DEFINE([HAVE_DIRFD], [1],
+                          [Define if you have the 'dirfd' function or macro.])],
+-- 
+2.55.0.windows.3
+
diff --git a/plugins/python-build/share/python-build/patches/3.12.3/Python-3.12.3/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch b/plugins/python-build/share/python-build/patches/3.12.3/Python-3.12.3/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
new file mode 100644
index 00000000..99f8bdb2
--- /dev/null
+++ b/plugins/python-build/share/python-build/patches/3.12.3/Python-3.12.3/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
@@ -0,0 +1,119 @@
+From c167d889c264347c658365acbb70bdd71c81550d Mon Sep 17 00:00:00 2001
+From: Ned Deily <nad@python.org>
+Date: Wed, 5 Aug 2026 10:30:17 +0300
+Subject: [PATCH] (downstream) [3.12] gh-153711: Avoid use of dup3 and pipe2
+ calls introduced in macOS 27 (#155211)
+
+---
+ ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
+ configure                                     | 33 +++++++++++--------
+ configure.ac                                  | 11 +++++--
+ 3 files changed, 32 insertions(+), 15 deletions(-)
+ create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+
+diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+new file mode 100644
+index 00000000000..90804c179a4
+--- /dev/null
++++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+@@ -0,0 +1,3 @@
++On macOS, do not attempt to use the :manpage:`dup3(2)` and
++:manpage:`pipe2(2)` system calls introduced in
++macOS 27 to prevent problems when running on older systems.
+diff --git a/configure b/configure
+index be783faa248..87fca7d195f 100755
+--- a/configure
++++ b/configure
+@@ -17591,13 +17591,7 @@ fi
+ ac_fn_c_check_func "$LINENO" "dup" "ac_cv_func_dup"
+ if test "x$ac_cv_func_dup" = xyes
+ then :
+-  printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
+-
+-fi
+-ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
+-if test "x$ac_cv_func_dup3" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
++  printf '%s\n' "#define HAVE_DUP 1" >>confdefs.h
+ 
+ fi
+ ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
+@@ -18067,12 +18061,6 @@ if test "x$ac_cv_func_pipe" = xyes
+ then :
+   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
+ 
+-fi
+-ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
+-if test "x$ac_cv_func_pipe2" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
+-
+ fi
+ ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
+ if test "x$ac_cv_func_plock" = xyes
+@@ -18647,6 +18635,25 @@ fi
+ 
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
++if test "x$ac_cv_func_dup3" = xyes
++then :
++  printf '%s\n' "#define HAVE_DUP3 1" >>confdefs.h
++
++fi
++ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
++if test "x$ac_cv_func_pipe2" = xyes
++then :
++  printf '%s\n' "#define HAVE_PIPE2 1" >>confdefs.h
++
++fi
++
++fi
++
+ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
+ printf %s "checking for $CC options needed to detect all undeclared functions... " >&6; }
+ if test ${ac_cv_c_undeclared_builtin_options+y}
+diff --git a/configure.ac b/configure.ac
+index 8be26cc0ab7..313b5bd62ce 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -4888,7 +4888,7 @@ fi
+ # checks for library functions
+ AC_CHECK_FUNCS([ \
+   accept4 alarm bind_textdomain_codeset chmod chown clock close_range confstr \
+-  copy_file_range ctermid dup dup3 execv explicit_bzero explicit_memset \
++  copy_file_range ctermid dup execv explicit_bzero explicit_memset \
+   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
+   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
+   gai_strerror getegid getentropy geteuid getgid getgrgid getgrgid_r \
+@@ -4898,7 +4898,7 @@ AC_CHECK_FUNCS([ \
+   getspnam getuid getwd if_nameindex initgroups kill killpg lchown linkat \
+   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
+   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
+-  pipe2 plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
++  plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
+   pread preadv preadv2 pthread_condattr_setclock pthread_init pthread_kill \
+   pwrite pwritev pwritev2 readlink readlinkat readv realpath renameat \
+   rtpSpawn sched_get_priority_max sched_rr_get_interval sched_setaffinity \
+@@ -4920,6 +4920,13 @@ if test "$MACHDEP" != linux; then
+   AC_CHECK_FUNCS([lchmod])
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  AC_CHECK_FUNCS([dup3 pipe2])
++fi
++
+ AC_CHECK_DECL([dirfd],
+               [AC_DEFINE([HAVE_DIRFD], [1],
+                          [Define if you have the 'dirfd' function or macro.])],
+-- 
+2.55.0.windows.3
+
diff --git a/plugins/python-build/share/python-build/patches/3.12.4/Python-3.12.4/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch b/plugins/python-build/share/python-build/patches/3.12.4/Python-3.12.4/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
new file mode 100644
index 00000000..0d729ef5
--- /dev/null
+++ b/plugins/python-build/share/python-build/patches/3.12.4/Python-3.12.4/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
@@ -0,0 +1,119 @@
+From 9e0a06e1ad5baa743064a4ef3b9b0faf83e3d061 Mon Sep 17 00:00:00 2001
+From: Ned Deily <nad@python.org>
+Date: Wed, 5 Aug 2026 10:30:17 +0300
+Subject: [PATCH] (downstream) [3.12] gh-153711: Avoid use of dup3 and pipe2
+ calls introduced in macOS 27 (#155211)
+
+---
+ ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
+ configure                                     | 33 +++++++++++--------
+ configure.ac                                  | 11 +++++--
+ 3 files changed, 32 insertions(+), 15 deletions(-)
+ create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+
+diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+new file mode 100644
+index 00000000000..90804c179a4
+--- /dev/null
++++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+@@ -0,0 +1,3 @@
++On macOS, do not attempt to use the :manpage:`dup3(2)` and
++:manpage:`pipe2(2)` system calls introduced in
++macOS 27 to prevent problems when running on older systems.
+diff --git a/configure b/configure
+index 6dc8a66e487..b2ce2542b9d 100755
+--- a/configure
++++ b/configure
+@@ -17591,13 +17591,7 @@ fi
+ ac_fn_c_check_func "$LINENO" "dup" "ac_cv_func_dup"
+ if test "x$ac_cv_func_dup" = xyes
+ then :
+-  printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
+-
+-fi
+-ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
+-if test "x$ac_cv_func_dup3" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
++  printf '%s\n' "#define HAVE_DUP 1" >>confdefs.h
+ 
+ fi
+ ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
+@@ -18067,12 +18061,6 @@ if test "x$ac_cv_func_pipe" = xyes
+ then :
+   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
+ 
+-fi
+-ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
+-if test "x$ac_cv_func_pipe2" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
+-
+ fi
+ ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
+ if test "x$ac_cv_func_plock" = xyes
+@@ -18647,6 +18635,25 @@ fi
+ 
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
++if test "x$ac_cv_func_dup3" = xyes
++then :
++  printf '%s\n' "#define HAVE_DUP3 1" >>confdefs.h
++
++fi
++ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
++if test "x$ac_cv_func_pipe2" = xyes
++then :
++  printf '%s\n' "#define HAVE_PIPE2 1" >>confdefs.h
++
++fi
++
++fi
++
+ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
+ printf %s "checking for $CC options needed to detect all undeclared functions... " >&6; }
+ if test ${ac_cv_c_undeclared_builtin_options+y}
+diff --git a/configure.ac b/configure.ac
+index 8a32cb58f4e..0cec0c7aeea 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -4896,7 +4896,7 @@ fi
+ # checks for library functions
+ AC_CHECK_FUNCS([ \
+   accept4 alarm bind_textdomain_codeset chmod chown clock close_range confstr \
+-  copy_file_range ctermid dup dup3 execv explicit_bzero explicit_memset \
++  copy_file_range ctermid dup execv explicit_bzero explicit_memset \
+   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
+   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
+   gai_strerror getegid getentropy geteuid getgid getgrgid getgrgid_r \
+@@ -4906,7 +4906,7 @@ AC_CHECK_FUNCS([ \
+   getspnam getuid getwd if_nameindex initgroups kill killpg lchown linkat \
+   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
+   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
+-  pipe2 plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
++  plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
+   pread preadv preadv2 pthread_condattr_setclock pthread_init pthread_kill \
+   pwrite pwritev pwritev2 readlink readlinkat readv realpath renameat \
+   rtpSpawn sched_get_priority_max sched_rr_get_interval sched_setaffinity \
+@@ -4928,6 +4928,13 @@ if test "$MACHDEP" != linux; then
+   AC_CHECK_FUNCS([lchmod])
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  AC_CHECK_FUNCS([dup3 pipe2])
++fi
++
+ AC_CHECK_DECL([dirfd],
+               [AC_DEFINE([HAVE_DIRFD], [1],
+                          [Define if you have the 'dirfd' function or macro.])],
+-- 
+2.55.0.windows.3
+
diff --git a/plugins/python-build/share/python-build/patches/3.12.5/Python-3.12.5/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch b/plugins/python-build/share/python-build/patches/3.12.5/Python-3.12.5/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
new file mode 100644
index 00000000..7210088d
--- /dev/null
+++ b/plugins/python-build/share/python-build/patches/3.12.5/Python-3.12.5/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
@@ -0,0 +1,119 @@
+From 16d9ac47e5e6b6e8020049622c697e8118999480 Mon Sep 17 00:00:00 2001
+From: Ned Deily <nad@python.org>
+Date: Wed, 5 Aug 2026 10:30:17 +0300
+Subject: [PATCH] (downstream) [3.12] gh-153711: Avoid use of dup3 and pipe2
+ calls introduced in macOS 27 (#155211)
+
+---
+ ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
+ configure                                     | 33 +++++++++++--------
+ configure.ac                                  | 11 +++++--
+ 3 files changed, 32 insertions(+), 15 deletions(-)
+ create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+
+diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+new file mode 100644
+index 00000000000..90804c179a4
+--- /dev/null
++++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+@@ -0,0 +1,3 @@
++On macOS, do not attempt to use the :manpage:`dup3(2)` and
++:manpage:`pipe2(2)` system calls introduced in
++macOS 27 to prevent problems when running on older systems.
+diff --git a/configure b/configure
+index 4dfaeecfc0b..bec4c9ac763 100755
+--- a/configure
++++ b/configure
+@@ -17591,13 +17591,7 @@ fi
+ ac_fn_c_check_func "$LINENO" "dup" "ac_cv_func_dup"
+ if test "x$ac_cv_func_dup" = xyes
+ then :
+-  printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
+-
+-fi
+-ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
+-if test "x$ac_cv_func_dup3" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
++  printf '%s\n' "#define HAVE_DUP 1" >>confdefs.h
+ 
+ fi
+ ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
+@@ -18067,12 +18061,6 @@ if test "x$ac_cv_func_pipe" = xyes
+ then :
+   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
+ 
+-fi
+-ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
+-if test "x$ac_cv_func_pipe2" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
+-
+ fi
+ ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
+ if test "x$ac_cv_func_plock" = xyes
+@@ -18647,6 +18635,25 @@ fi
+ 
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
++if test "x$ac_cv_func_dup3" = xyes
++then :
++  printf '%s\n' "#define HAVE_DUP3 1" >>confdefs.h
++
++fi
++ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
++if test "x$ac_cv_func_pipe2" = xyes
++then :
++  printf '%s\n' "#define HAVE_PIPE2 1" >>confdefs.h
++
++fi
++
++fi
++
+ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
+ printf %s "checking for $CC options needed to detect all undeclared functions... " >&6; }
+ if test ${ac_cv_c_undeclared_builtin_options+y}
+diff --git a/configure.ac b/configure.ac
+index 0d6df8e24e4..cbf749da60b 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -4896,7 +4896,7 @@ fi
+ # checks for library functions
+ AC_CHECK_FUNCS([ \
+   accept4 alarm bind_textdomain_codeset chmod chown clock close_range confstr \
+-  copy_file_range ctermid dup dup3 execv explicit_bzero explicit_memset \
++  copy_file_range ctermid dup execv explicit_bzero explicit_memset \
+   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
+   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
+   gai_strerror getegid getentropy geteuid getgid getgrgid getgrgid_r \
+@@ -4906,7 +4906,7 @@ AC_CHECK_FUNCS([ \
+   getspnam getuid getwd if_nameindex initgroups kill killpg lchown linkat \
+   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
+   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
+-  pipe2 plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
++  plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
+   pread preadv preadv2 pthread_condattr_setclock pthread_init pthread_kill \
+   pwrite pwritev pwritev2 readlink readlinkat readv realpath renameat \
+   rtpSpawn sched_get_priority_max sched_rr_get_interval sched_setaffinity \
+@@ -4928,6 +4928,13 @@ if test "$MACHDEP" != linux; then
+   AC_CHECK_FUNCS([lchmod])
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  AC_CHECK_FUNCS([dup3 pipe2])
++fi
++
+ AC_CHECK_DECL([dirfd],
+               [AC_DEFINE([HAVE_DIRFD], [1],
+                          [Define if you have the 'dirfd' function or macro.])],
+-- 
+2.55.0.windows.3
+
diff --git a/plugins/python-build/share/python-build/patches/3.12.6/Python-3.12.6/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch b/plugins/python-build/share/python-build/patches/3.12.6/Python-3.12.6/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
new file mode 100644
index 00000000..6795f4c2
--- /dev/null
+++ b/plugins/python-build/share/python-build/patches/3.12.6/Python-3.12.6/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
@@ -0,0 +1,119 @@
+From 33d7809038f73f689c4a7d622dbf49e90774f1ff Mon Sep 17 00:00:00 2001
+From: Ned Deily <nad@python.org>
+Date: Wed, 5 Aug 2026 10:30:17 +0300
+Subject: [PATCH] (downstream) [3.12] gh-153711: Avoid use of dup3 and pipe2
+ calls introduced in macOS 27 (#155211)
+
+---
+ ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
+ configure                                     | 33 +++++++++++--------
+ configure.ac                                  | 11 +++++--
+ 3 files changed, 32 insertions(+), 15 deletions(-)
+ create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+
+diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+new file mode 100644
+index 00000000000..90804c179a4
+--- /dev/null
++++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+@@ -0,0 +1,3 @@
++On macOS, do not attempt to use the :manpage:`dup3(2)` and
++:manpage:`pipe2(2)` system calls introduced in
++macOS 27 to prevent problems when running on older systems.
+diff --git a/configure b/configure
+index 4dfaeecfc0b..bec4c9ac763 100755
+--- a/configure
++++ b/configure
+@@ -17591,13 +17591,7 @@ fi
+ ac_fn_c_check_func "$LINENO" "dup" "ac_cv_func_dup"
+ if test "x$ac_cv_func_dup" = xyes
+ then :
+-  printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
+-
+-fi
+-ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
+-if test "x$ac_cv_func_dup3" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
++  printf '%s\n' "#define HAVE_DUP 1" >>confdefs.h
+ 
+ fi
+ ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
+@@ -18067,12 +18061,6 @@ if test "x$ac_cv_func_pipe" = xyes
+ then :
+   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
+ 
+-fi
+-ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
+-if test "x$ac_cv_func_pipe2" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
+-
+ fi
+ ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
+ if test "x$ac_cv_func_plock" = xyes
+@@ -18647,6 +18635,25 @@ fi
+ 
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
++if test "x$ac_cv_func_dup3" = xyes
++then :
++  printf '%s\n' "#define HAVE_DUP3 1" >>confdefs.h
++
++fi
++ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
++if test "x$ac_cv_func_pipe2" = xyes
++then :
++  printf '%s\n' "#define HAVE_PIPE2 1" >>confdefs.h
++
++fi
++
++fi
++
+ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
+ printf %s "checking for $CC options needed to detect all undeclared functions... " >&6; }
+ if test ${ac_cv_c_undeclared_builtin_options+y}
+diff --git a/configure.ac b/configure.ac
+index 0d6df8e24e4..cbf749da60b 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -4896,7 +4896,7 @@ fi
+ # checks for library functions
+ AC_CHECK_FUNCS([ \
+   accept4 alarm bind_textdomain_codeset chmod chown clock close_range confstr \
+-  copy_file_range ctermid dup dup3 execv explicit_bzero explicit_memset \
++  copy_file_range ctermid dup execv explicit_bzero explicit_memset \
+   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
+   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
+   gai_strerror getegid getentropy geteuid getgid getgrgid getgrgid_r \
+@@ -4906,7 +4906,7 @@ AC_CHECK_FUNCS([ \
+   getspnam getuid getwd if_nameindex initgroups kill killpg lchown linkat \
+   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
+   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
+-  pipe2 plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
++  plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
+   pread preadv preadv2 pthread_condattr_setclock pthread_init pthread_kill \
+   pwrite pwritev pwritev2 readlink readlinkat readv realpath renameat \
+   rtpSpawn sched_get_priority_max sched_rr_get_interval sched_setaffinity \
+@@ -4928,6 +4928,13 @@ if test "$MACHDEP" != linux; then
+   AC_CHECK_FUNCS([lchmod])
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  AC_CHECK_FUNCS([dup3 pipe2])
++fi
++
+ AC_CHECK_DECL([dirfd],
+               [AC_DEFINE([HAVE_DIRFD], [1],
+                          [Define if you have the 'dirfd' function or macro.])],
+-- 
+2.55.0.windows.3
+
diff --git a/plugins/python-build/share/python-build/patches/3.12.7/Python-3.12.7/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch b/plugins/python-build/share/python-build/patches/3.12.7/Python-3.12.7/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
new file mode 100644
index 00000000..1621ee1d
--- /dev/null
+++ b/plugins/python-build/share/python-build/patches/3.12.7/Python-3.12.7/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
@@ -0,0 +1,119 @@
+From 2b8183e6b45ec2b5d591c034687e7f0ba5eb1bbc Mon Sep 17 00:00:00 2001
+From: Ned Deily <nad@python.org>
+Date: Wed, 5 Aug 2026 10:30:17 +0300
+Subject: [PATCH] (downstream) [3.12] gh-153711: Avoid use of dup3 and pipe2
+ calls introduced in macOS 27 (#155211)
+
+---
+ ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
+ configure                                     | 33 +++++++++++--------
+ configure.ac                                  | 11 +++++--
+ 3 files changed, 32 insertions(+), 15 deletions(-)
+ create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+
+diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+new file mode 100644
+index 00000000000..90804c179a4
+--- /dev/null
++++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+@@ -0,0 +1,3 @@
++On macOS, do not attempt to use the :manpage:`dup3(2)` and
++:manpage:`pipe2(2)` system calls introduced in
++macOS 27 to prevent problems when running on older systems.
+diff --git a/configure b/configure
+index 1c75810d9e8..439464c2d98 100755
+--- a/configure
++++ b/configure
+@@ -17591,13 +17591,7 @@ fi
+ ac_fn_c_check_func "$LINENO" "dup" "ac_cv_func_dup"
+ if test "x$ac_cv_func_dup" = xyes
+ then :
+-  printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
+-
+-fi
+-ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
+-if test "x$ac_cv_func_dup3" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
++  printf '%s\n' "#define HAVE_DUP 1" >>confdefs.h
+ 
+ fi
+ ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
+@@ -18067,12 +18061,6 @@ if test "x$ac_cv_func_pipe" = xyes
+ then :
+   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
+ 
+-fi
+-ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
+-if test "x$ac_cv_func_pipe2" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
+-
+ fi
+ ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
+ if test "x$ac_cv_func_plock" = xyes
+@@ -18647,6 +18635,25 @@ fi
+ 
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
++if test "x$ac_cv_func_dup3" = xyes
++then :
++  printf '%s\n' "#define HAVE_DUP3 1" >>confdefs.h
++
++fi
++ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
++if test "x$ac_cv_func_pipe2" = xyes
++then :
++  printf '%s\n' "#define HAVE_PIPE2 1" >>confdefs.h
++
++fi
++
++fi
++
+ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
+ printf %s "checking for $CC options needed to detect all undeclared functions... " >&6; }
+ if test ${ac_cv_c_undeclared_builtin_options+y}
+diff --git a/configure.ac b/configure.ac
+index d0d54050286..94b624b3e0c 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -4896,7 +4896,7 @@ fi
+ # checks for library functions
+ AC_CHECK_FUNCS([ \
+   accept4 alarm bind_textdomain_codeset chmod chown clock close_range confstr \
+-  copy_file_range ctermid dup dup3 execv explicit_bzero explicit_memset \
++  copy_file_range ctermid dup execv explicit_bzero explicit_memset \
+   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
+   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
+   gai_strerror getegid getentropy geteuid getgid getgrgid getgrgid_r \
+@@ -4906,7 +4906,7 @@ AC_CHECK_FUNCS([ \
+   getspnam getuid getwd if_nameindex initgroups kill killpg lchown linkat \
+   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
+   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
+-  pipe2 plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
++  plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
+   pread preadv preadv2 pthread_condattr_setclock pthread_init pthread_kill \
+   pwrite pwritev pwritev2 readlink readlinkat readv realpath renameat \
+   rtpSpawn sched_get_priority_max sched_rr_get_interval sched_setaffinity \
+@@ -4928,6 +4928,13 @@ if test "$MACHDEP" != linux; then
+   AC_CHECK_FUNCS([lchmod])
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  AC_CHECK_FUNCS([dup3 pipe2])
++fi
++
+ AC_CHECK_DECL([dirfd],
+               [AC_DEFINE([HAVE_DIRFD], [1],
+                          [Define if you have the 'dirfd' function or macro.])],
+-- 
+2.55.0.windows.3
+
diff --git a/plugins/python-build/share/python-build/patches/3.12.8/Python-3.12.8/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch b/plugins/python-build/share/python-build/patches/3.12.8/Python-3.12.8/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
new file mode 100644
index 00000000..7bc58a49
--- /dev/null
+++ b/plugins/python-build/share/python-build/patches/3.12.8/Python-3.12.8/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
@@ -0,0 +1,119 @@
+From d92ec3351dd6a0cc2e2fe10bae23ffdb817de42d Mon Sep 17 00:00:00 2001
+From: Ned Deily <nad@python.org>
+Date: Wed, 5 Aug 2026 10:30:17 +0300
+Subject: [PATCH] (downstream) [3.12] gh-153711: Avoid use of dup3 and pipe2
+ calls introduced in macOS 27 (#155211)
+
+---
+ ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
+ configure                                     | 33 +++++++++++--------
+ configure.ac                                  | 11 +++++--
+ 3 files changed, 32 insertions(+), 15 deletions(-)
+ create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+
+diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+new file mode 100644
+index 00000000000..90804c179a4
+--- /dev/null
++++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+@@ -0,0 +1,3 @@
++On macOS, do not attempt to use the :manpage:`dup3(2)` and
++:manpage:`pipe2(2)` system calls introduced in
++macOS 27 to prevent problems when running on older systems.
+diff --git a/configure b/configure
+index 241cf8f3d4a..62575e79243 100755
+--- a/configure
++++ b/configure
+@@ -17594,13 +17594,7 @@ fi
+ ac_fn_c_check_func "$LINENO" "dup" "ac_cv_func_dup"
+ if test "x$ac_cv_func_dup" = xyes
+ then :
+-  printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
+-
+-fi
+-ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
+-if test "x$ac_cv_func_dup3" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
++  printf '%s\n' "#define HAVE_DUP 1" >>confdefs.h
+ 
+ fi
+ ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
+@@ -18070,12 +18064,6 @@ if test "x$ac_cv_func_pipe" = xyes
+ then :
+   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
+ 
+-fi
+-ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
+-if test "x$ac_cv_func_pipe2" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
+-
+ fi
+ ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
+ if test "x$ac_cv_func_plock" = xyes
+@@ -18650,6 +18638,25 @@ fi
+ 
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
++if test "x$ac_cv_func_dup3" = xyes
++then :
++  printf '%s\n' "#define HAVE_DUP3 1" >>confdefs.h
++
++fi
++ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
++if test "x$ac_cv_func_pipe2" = xyes
++then :
++  printf '%s\n' "#define HAVE_PIPE2 1" >>confdefs.h
++
++fi
++
++fi
++
+ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
+ printf %s "checking for $CC options needed to detect all undeclared functions... " >&6; }
+ if test ${ac_cv_c_undeclared_builtin_options+y}
+diff --git a/configure.ac b/configure.ac
+index 9270b5f7172..7225a26752e 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -4899,7 +4899,7 @@ fi
+ # checks for library functions
+ AC_CHECK_FUNCS([ \
+   accept4 alarm bind_textdomain_codeset chmod chown clock close_range confstr \
+-  copy_file_range ctermid dup dup3 execv explicit_bzero explicit_memset \
++  copy_file_range ctermid dup execv explicit_bzero explicit_memset \
+   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
+   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
+   gai_strerror getegid getentropy geteuid getgid getgrgid getgrgid_r \
+@@ -4909,7 +4909,7 @@ AC_CHECK_FUNCS([ \
+   getspnam getuid getwd if_nameindex initgroups kill killpg lchown linkat \
+   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
+   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
+-  pipe2 plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
++  plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
+   pread preadv preadv2 pthread_condattr_setclock pthread_init pthread_kill \
+   pwrite pwritev pwritev2 readlink readlinkat readv realpath renameat \
+   rtpSpawn sched_get_priority_max sched_rr_get_interval sched_setaffinity \
+@@ -4931,6 +4931,13 @@ if test "$MACHDEP" != linux; then
+   AC_CHECK_FUNCS([lchmod])
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  AC_CHECK_FUNCS([dup3 pipe2])
++fi
++
+ AC_CHECK_DECL([dirfd],
+               [AC_DEFINE([HAVE_DIRFD], [1],
+                          [Define if you have the 'dirfd' function or macro.])],
+-- 
+2.55.0.windows.3
+
diff --git a/plugins/python-build/share/python-build/patches/3.12.9/Python-3.12.9/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch b/plugins/python-build/share/python-build/patches/3.12.9/Python-3.12.9/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
new file mode 100644
index 00000000..cb566e24
--- /dev/null
+++ b/plugins/python-build/share/python-build/patches/3.12.9/Python-3.12.9/0001-downstream-3.12-gh-153711-Avoid-use-of-dup3-and-pipe.patch
@@ -0,0 +1,119 @@
+From 99908afd676839023dd45807502e0018e3347268 Mon Sep 17 00:00:00 2001
+From: Ned Deily <nad@python.org>
+Date: Wed, 5 Aug 2026 10:30:17 +0300
+Subject: [PATCH] (downstream) [3.12] gh-153711: Avoid use of dup3 and pipe2
+ calls introduced in macOS 27 (#155211)
+
+---
+ ...-08-05-02-02-33.gh-issue-153711.pO9fFb.rst |  3 ++
+ configure                                     | 33 +++++++++++--------
+ configure.ac                                  | 11 +++++--
+ 3 files changed, 32 insertions(+), 15 deletions(-)
+ create mode 100644 Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+
+diff --git a/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+new file mode 100644
+index 00000000000..90804c179a4
+--- /dev/null
++++ b/Misc/NEWS.d/next/macOS/2026-08-05-02-02-33.gh-issue-153711.pO9fFb.rst
+@@ -0,0 +1,3 @@
++On macOS, do not attempt to use the :manpage:`dup3(2)` and
++:manpage:`pipe2(2)` system calls introduced in
++macOS 27 to prevent problems when running on older systems.
+diff --git a/configure b/configure
+index 89edc42f45c..e099c5ad55a 100755
+--- a/configure
++++ b/configure
+@@ -17614,13 +17614,7 @@ fi
+ ac_fn_c_check_func "$LINENO" "dup" "ac_cv_func_dup"
+ if test "x$ac_cv_func_dup" = xyes
+ then :
+-  printf "%s\n" "#define HAVE_DUP 1" >>confdefs.h
+-
+-fi
+-ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
+-if test "x$ac_cv_func_dup3" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_DUP3 1" >>confdefs.h
++  printf '%s\n' "#define HAVE_DUP 1" >>confdefs.h
+ 
+ fi
+ ac_fn_c_check_func "$LINENO" "execv" "ac_cv_func_execv"
+@@ -18090,12 +18084,6 @@ if test "x$ac_cv_func_pipe" = xyes
+ then :
+   printf "%s\n" "#define HAVE_PIPE 1" >>confdefs.h
+ 
+-fi
+-ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
+-if test "x$ac_cv_func_pipe2" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_PIPE2 1" >>confdefs.h
+-
+ fi
+ ac_fn_c_check_func "$LINENO" "plock" "ac_cv_func_plock"
+ if test "x$ac_cv_func_plock" = xyes
+@@ -18670,6 +18658,25 @@ fi
+ 
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  ac_fn_c_check_func "$LINENO" "dup3" "ac_cv_func_dup3"
++if test "x$ac_cv_func_dup3" = xyes
++then :
++  printf '%s\n' "#define HAVE_DUP3 1" >>confdefs.h
++
++fi
++ac_fn_c_check_func "$LINENO" "pipe2" "ac_cv_func_pipe2"
++if test "x$ac_cv_func_pipe2" = xyes
++then :
++  printf '%s\n' "#define HAVE_PIPE2 1" >>confdefs.h
++
++fi
++
++fi
++
+ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
+ printf %s "checking for $CC options needed to detect all undeclared functions... " >&6; }
+ if test ${ac_cv_c_undeclared_builtin_options+y}
+diff --git a/configure.ac b/configure.ac
+index 1a02d19f1b2..f2b58421d74 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -4920,7 +4920,7 @@ fi
+ # checks for library functions
+ AC_CHECK_FUNCS([ \
+   accept4 alarm bind_textdomain_codeset chmod chown clock close_range confstr \
+-  copy_file_range ctermid dup dup3 execv explicit_bzero explicit_memset \
++  copy_file_range ctermid dup execv explicit_bzero explicit_memset \
+   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
+   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
+   gai_strerror getegid getentropy geteuid getgid getgrgid getgrgid_r \
+@@ -4930,7 +4930,7 @@ AC_CHECK_FUNCS([ \
+   getspnam getuid getwd if_nameindex initgroups kill killpg lchown linkat \
+   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
+   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
+-  pipe2 plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
++  plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
+   pread preadv preadv2 pthread_condattr_setclock pthread_init pthread_kill \
+   pwrite pwritev pwritev2 readlink readlinkat readv realpath renameat \
+   rtpSpawn sched_get_priority_max sched_rr_get_interval sched_setaffinity \
+@@ -4952,6 +4952,13 @@ if test "$MACHDEP" != linux; then
+   AC_CHECK_FUNCS([lchmod])
+ fi
+ 
++# macOS introduced dup3 and pipe2 in macOS 27, late in the
++# lifetime of this version of Python. Rather than adding weaklinking
++# support for them, just continue to ignore them.
++if test "$ac_sys_system" != "Darwin"; then
++  AC_CHECK_FUNCS([dup3 pipe2])
++fi
++
+ AC_CHECK_DECL([dirfd],
+               [AC_DEFINE([HAVE_DIRFD], [1],
+                          [Define if you have the 'dirfd' function or macro.])],
+-- 
+2.55.0.windows.3
+