diff --git a/admin/acinclude.m4.in b/admin/acinclude.m4.in
index f7fb58e..231ae39 100644
--- a/admin/acinclude.m4.in
+++ b/admin/acinclude.m4.in
@@ -5292,7 +5292,7 @@ AC_DEFINE_UNQUOTED(KDEMAXPATHLEN,$ac_cv_maxpathlen, [Define a safe value for MAX
 AC_DEFUN([KDE_CHECK_HEADER],
 [
    kde_safe_cppflags=$CPPFLAGS
-   CPPFLAGS="$CPPFLAGS $all_includes"
+   CPPFLAGS="$CPPFLAGS $all_includes -I/usr/include/tqt"
    AC_LANG_SAVE
    AC_LANG_CPLUSPLUS
    AC_CHECK_HEADER([$1], [$2], [$3], [$4])
@@ -5305,7 +5305,7 @@ AC_DEFUN([KDE_CHECK_HEADERS],
    AH_CHECK_HEADERS([$1])
    AC_LANG_SAVE
    kde_safe_cppflags=$CPPFLAGS
-   CPPFLAGS="$CPPFLAGS $all_includes"
+   CPPFLAGS="$CPPFLAGS $all_includes -I/usr/include/tqt"
    AC_LANG_CPLUSPLUS
    AC_CHECK_HEADERS([$1], [$2], [$3], [$4])
    CPPFLAGS=$kde_safe_cppflags