diff --git a/admin/acinclude.m4.in b/admin/acinclude.m4.in
index 8526a8d..aee3f3d 100644
--- a/admin/acinclude.m4.in
+++ b/admin/acinclude.m4.in
@@ -4956,6 +4956,7 @@ AC_DEFUN([KDE_CHECK_STL],
     AC_LANG_CPLUSPLUS
     ac_save_CXXFLAGS="$CXXFLAGS"
     CXXFLAGS="`echo $CXXFLAGS | sed s/-fno-exceptions//`"
+    CXXFLAGS="$CXXFLAGS -I$qt_includes"
 
     AC_MSG_CHECKING([if C++ programs can be compiled])
     AC_CACHE_VAL(kde_cv_stl_works,