diff --git a/acinclude.m4 b/acinclude.m4
index 54c91b85d..c2f9d270e 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -388,6 +388,7 @@ AC_SUBST(LOGODIR_VAR)
 AC_SUBST(PRIVATE_HTTPDDIR)
 AC_SUBST(PUBLIC_HTTPDDIR)
 AC_SUBST(HOSTED_HTTPDDIR)
+AC_SUBST(FLAGDIR)
 dnl end workaround
 
 AC_DEFUN([_TUXBOX_APPS_LIB_CONFIG], [