fix install error with clang toolchain

metacity.spec

@@ -1,6 +1,6 @@
 Name:           metacity
 Version:        3.37.1
-Release:        4
+Release:        5
 Summary:        Window Manager for the MATE and GNOME Flashback desktops
 License:        GPLv2+
 URL:            https://download.gnome.org/sources/metacity/
@@ -46,7 +46,7 @@ developing applications that use %{name}.
 rm -f src/org.gnome.metacity.gschema.valid
 
 %build
-CPPFLAGS="$CPPFLAGS -I$RPM_BUILD_ROOT%{_includedir}"
+CPPFLAGS="$CPPFLAGS -I%{_builddir}/%{_includedir}"
 export CPPFLAGS
 rm -f configure
 (if ! test -x configure; then autoreconf -i -f; fi;
@@ -88,6 +88,9 @@ make CPPFLAGS="$CPPFLAGS" LIBS="$LIBS" %{?_smp_mflags}
 %{_mandir}/man1/*.gz
 
 %changelog
+* Mon Aug 14 2023 liyunfei <liyunfei33@huawei.com> - 3.37.1-5
+- fix install error with clang toolchain
+
 * Mon Aug 07 2023 zhouwenpei <zhouwenpei1@h-partners.com> - 3.37.1-4
 - fix build error