--- tests/test-mbox.c.orig	2016-12-10 00:13:41 UTC
+++ tests/test-mbox.c
@@ -31,6 +31,7 @@
 #include <fcntl.h>
 #include <time.h>
 
+#include <config.h>
 #include <gmime/gmime.h>
 
 #include "testsuite.h"
