diff --git a/package/x11r7/xlib_libXxf86dga/Config.in b/package/x11r7/xlib_libXxf86dga/Config.in
index 5e21502cda..8276b7178f 100644
--- a/package/x11r7/xlib_libXxf86dga/Config.in
+++ b/package/x11r7/xlib_libXxf86dga/Config.in
@@ -1,5 +1,6 @@
 config BR2_PACKAGE_XLIB_LIBXXF86DGA
 	bool "libXxf86dga"
+	depends on BR2_USE_MMU # fork()
 	select BR2_PACKAGE_XLIB_LIBX11
 	select BR2_PACKAGE_XLIB_LIBXEXT
 	select BR2_PACKAGE_XPROTO_XF86DGAPROTO