diff --git a/legacy/embryo/src/bin/embryo_cc_prefix.c b/legacy/embryo/src/bin/embryo_cc_prefix.c
index 38dddf919a..cd89baa033 100644
--- a/legacy/embryo/src/bin/embryo_cc_prefix.c
+++ b/legacy/embryo/src/bin/embryo_cc_prefix.c
@@ -1,7 +1,10 @@
 /*
  * vim:ts=8:sw=3:sts=8:noexpandtab:cino=>5n-3f0^-2{2
  */
-#include "config.h"
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>