--- a/hxnum.c	2016-03-20 16:18:47.815855780 +0100
+++ b/hxnum.c	2016-03-20 16:19:40.197200923 +0100
@@ -29,6 +29,7 @@
 #endif
 #include <stdlib.h>
 #include <assert.h>
+#include <getopt.h>
 #include "export.h"
 #include "types.e"
 #include "class.e"