diff --git a/Misc/NEWS.d/next/Library/2024-12-04-11-01-16.gh-issue-93312.9sB-Qw.rst b/Misc/NEWS.d/next/Library/2024-12-04-11-01-16.gh-issue-93312.9sB-Qw.rst
new file mode 100644
index 0000000..e245fa2
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2024-12-04-11-01-16.gh-issue-93312.9sB-Qw.rst
@@ -0,0 +1,2 @@
+Include ``<sys/pidfd.h>`` to get ``os.PIDFD_NONBLOCK`` constant. Patch by
+Victor Stinner.
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 6eb7054..2c26fbe 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -73,6 +73,9 @@
 #ifdef HAVE_SYS_TIME_H
 #  include <sys/time.h>           // futimes()
 #endif
+#ifdef HAVE_SYS_PIDFD_H
+#  include <sys/pidfd.h>          // PIDFD_NONBLOCK
+#endif
 
 
 // SGI apparently needs this forward declaration
diff --git a/configure b/configure
index 2fa473b..5e9bcb6 100755
--- a/configure
+++ b/configure
@@ -11179,6 +11179,12 @@
   printf "%s\n" "#define HAVE_SYS_PARAM_H 1" >>confdefs.h
 
 fi
+ac_fn_c_check_header_compile "$LINENO" "sys/pidfd.h" "ac_cv_header_sys_pidfd_h" "$ac_includes_default"
+if test "x$ac_cv_header_sys_pidfd_h" = xyes
+then :
+  printf "%s\n" "#define HAVE_SYS_PIDFD_H 1" >>confdefs.h
+
+fi
 ac_fn_c_check_header_compile "$LINENO" "sys/poll.h" "ac_cv_header_sys_poll_h" "$ac_includes_default"
 if test "x$ac_cv_header_sys_poll_h" = xyes
 then :
diff --git a/configure.ac b/configure.ac
index 8ca8e0f..bf3685e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2932,7 +2932,7 @@
   linux/tipc.h linux/wait.h netdb.h net/ethernet.h netinet/in.h netpacket/packet.h poll.h process.h pthread.h pty.h \
   sched.h setjmp.h shadow.h signal.h spawn.h stropts.h sys/audioio.h sys/bsdtty.h sys/devpoll.h \
   sys/endian.h sys/epoll.h sys/event.h sys/eventfd.h sys/file.h sys/ioctl.h sys/kern_control.h \
-  sys/loadavg.h sys/lock.h sys/memfd.h sys/mkdev.h sys/mman.h sys/modem.h sys/param.h sys/poll.h \
+  sys/loadavg.h sys/lock.h sys/memfd.h sys/mkdev.h sys/mman.h sys/modem.h sys/param.h sys/pidfd.h sys/poll.h \
   sys/random.h sys/resource.h sys/select.h sys/sendfile.h sys/socket.h sys/soundcard.h sys/stat.h \
   sys/statvfs.h sys/sys_domain.h sys/syscall.h sys/sysmacros.h sys/termio.h sys/time.h sys/times.h sys/timerfd.h \
   sys/types.h sys/uio.h sys/un.h sys/utsname.h sys/wait.h sys/xattr.h sysexits.h syslog.h \
diff --git a/pyconfig.h.in b/pyconfig.h.in
index 924d866..6a1f128 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -1388,6 +1388,9 @@
 /* Define to 1 if you have the <sys/param.h> header file. */
 #undef HAVE_SYS_PARAM_H
 
+/* Define to 1 if you have the <sys/pidfd.h> header file. */
+#undef HAVE_SYS_PIDFD_H
+
 /* Define to 1 if you have the <sys/poll.h> header file. */
 #undef HAVE_SYS_POLL_H