freebsd-ports/math/primegen/files/patch-primegaps.c

--- primegaps.c.orig	2009-03-27 09:17:07.000000000 -0300
+++ primegaps.c	2009-03-27 09:17:19.000000000 -0300
@@ -1,4 +1,5 @@
 #include <math.h>
+#include <stdio.h>
 #include "primegen.h"
 
 primegen pg;