From d6acdc1b60de4f6fd05c6654a9661b7edddf0448 Mon Sep 17 00:00:00 2001
From: Christian Heimes <christian@python.org>
Date: Fri, 1 Jul 2022 09:23:41 +0200
Subject: [PATCH] gh-90005-ffi: Fix building _ctypes without pkg-config
 (GH-94451)

The fallback path did not set LIBFFI_LIBS variable to link with ``-lffi``.
---
 .../2022-06-30-17-00-54.gh-issue-90005.iiq5qD.rst      |  1 +
 configure                                              | 10 ++++++++--
 configure.ac                                           |  5 ++++-
 3 files changed, 13 insertions(+), 3 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Build/2022-06-30-17-00-54.gh-issue-90005.iiq5qD.rst

diff --git a/Misc/NEWS.d/next/Build/2022-06-30-17-00-54.gh-issue-90005.iiq5qD.rst b/Misc/NEWS.d/next/Build/2022-06-30-17-00-54.gh-issue-90005.iiq5qD.rst
new file mode 100644
index 00000000000..62f40b8f95f
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2022-06-30-17-00-54.gh-issue-90005.iiq5qD.rst
@@ -0,0 +1 @@
+Fix building ``_ctypes`` extension without ``pkg-config``.
diff --git a/configure b/configure
index 014d2cefb47..9144ee19036 100755
--- a/configure
+++ b/configure
@@ -12133,7 +12133,10 @@ fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ffi_ffi_call" >&5
 $as_echo "$ac_cv_lib_ffi_ffi_call" >&6; }
 if test "x$ac_cv_lib_ffi_ffi_call" = xyes; then :
-  have_libffi=yes
+
+          have_libffi=yes
+          LIBFFI_LIBS="-lffi"
+
 else
   have_libffi=no
 fi
@@ -12200,7 +12203,10 @@ fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ffi_ffi_call" >&5
 $as_echo "$ac_cv_lib_ffi_ffi_call" >&6; }
 if test "x$ac_cv_lib_ffi_ffi_call" = xyes; then :
-  have_libffi=yes
+
+          have_libffi=yes
+          LIBFFI_LIBS="-lffi"
+
 else
   have_libffi=no
 fi
diff --git a/configure.ac b/configure.ac
index ab1c6873f73..12ae2ae8d87 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3605,7 +3605,10 @@ AS_VAR_IF([with_system_ffi], [yes], [
   PKG_CHECK_MODULES([LIBFFI], [libffi], [have_libffi=yes], [
     AC_CHECK_HEADER([ffi.h], [
       WITH_SAVE_ENV([
-        AC_CHECK_LIB([ffi], [ffi_call], [have_libffi=yes], [have_libffi=no])
+        AC_CHECK_LIB([ffi], [ffi_call], [
+          have_libffi=yes
+          LIBFFI_LIBS="-lffi"
+        ], [have_libffi=no])
       ])
     ])
   ])