From e50aaf854703a870f4e1e61da025842248d68bde Mon Sep 17 00:00:00 2001
From: Kai Pastor <dg0yt@darc.de>
Date: Thu, 28 Dec 2023 10:41:12 +0100
Subject: FindPkgConfig: Update cache variables after isystem extraction

Fixes: #25377
---
 Modules/FindPkgConfig.cmake | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Modules/FindPkgConfig.cmake b/Modules/FindPkgConfig.cmake
index 1c1850a..1b6a72a 100644
--- a/Modules/FindPkgConfig.cmake
+++ b/Modules/FindPkgConfig.cmake
@@ -667,6 +667,9 @@ macro(_pkg_check_modules_internal _is_required _is_silent _no_cmake_path _no_cma
 
       if (${_prefix}_CFLAGS_OTHER MATCHES "-isystem")
         _pkgconfig_extract_isystem("${_prefix}")
+        # Using _pkgconfig_set in this scope so that a future policy can switch to normal variables
+        _pkgconfig_set("${_pkg_check_prefix}_CFLAGS_OTHER" "${${_pkg_check_prefix}_CFLAGS_OTHER}")
+        _pkgconfig_set("${_pkg_check_prefix}_INCLUDE_DIRS" "${${_pkg_check_prefix}_INCLUDE_DIRS}")
       endif ()
 
       _pkg_recalculate("${_prefix}" ${_no_cmake_path} ${_no_cmake_environment_path} ${_imp_target} ${_imp_target_global})
-- 
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