diff --git a/hw/xquartz/GL/capabilities.c b/hw/xquartz/GL/capabilities.c
index 4702595f4..5573629fd 100644
--- a/hw/xquartz/GL/capabilities.c
+++ b/hw/xquartz/GL/capabilities.c
@@ -20,6 +20,10 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <assert.h>