From dd1776eee5681b93d9a62a25ea6169882b6426e9 Mon Sep 17 00:00:00 2001
From: Shamil Abdulaev <ashm.tech@proton.me>
Date: Tue, 18 Nov 2025 13:35:04 +0300
Subject: [PATCH] gh-39936: Fix pyconfig.h installation path with --includedir

---
 Makefile.pre.in                                               | 2 +-
 .../next/Build/2025-11-18-10-30-45.gh-issue-39936.Kx9mPq.rst  | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Build/2025-11-18-10-30-45.gh-issue-39936.Kx9mPq.rst

diff --git a/Makefile.pre.in b/Makefile.pre.in
index dd28ff5d2a3ed1..73f12c397f9222 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -156,7 +156,7 @@ BINDIR=		@bindir@
 LIBDIR=		@libdir@
 MANDIR=		@mandir@
 INCLUDEDIR=	@includedir@
-CONFINCLUDEDIR=	$(exec_prefix)/include
+CONFINCLUDEDIR=	$(INCLUDEDIR)
 PLATLIBDIR=	@PLATLIBDIR@
 SCRIPTDIR=	$(prefix)/$(PLATLIBDIR)
 # executable name for shebangs
diff --git a/Misc/NEWS.d/next/Build/2025-11-18-10-30-45.gh-issue-39936.Kx9mPq.rst b/Misc/NEWS.d/next/Build/2025-11-18-10-30-45.gh-issue-39936.Kx9mPq.rst
new file mode 100644
index 00000000000000..886ff0cbf50232
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2025-11-18-10-30-45.gh-issue-39936.Kx9mPq.rst
@@ -0,0 +1,4 @@
+Fixed ``pyconfig.h`` installation to respect ``--includedir`` configure option.
+Previously, ``pyconfig.h`` was always installed to ``$(exec_prefix)/include``
+instead of the directory specified by ``--includedir``.
+Patch by Shamil Abdulaev.