diff -ur abusybox-1.20.2/include/libbb.h busybox-1.20.2/include/libbb.h
--- abusybox-1.20.2/include/libbb.h	2012-07-02 17:08:25.000000000 +0300
+++ busybox-1.20.2/include/libbb.h	2012-09-16 14:41:52.391970119 +0300
@@ -44,6 +44,7 @@
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/types.h>
+#include <sys/resource.h>
 #ifndef major
 # include <sys/sysmacros.h>
 #endif