diff -Nur busybox-1.19.4.orig/include/libbb.h busybox-1.19.4/include/libbb.h
--- busybox-1.19.4.orig/include/libbb.h	2012-02-04 20:34:24.000000000 +0100
+++ busybox-1.19.4/include/libbb.h	2012-07-31 10:33:50.000000000 +0200
@@ -35,6 +35,7 @@
 #include <sys/poll.h>
 #include <sys/ioctl.h>
 #include <sys/mman.h>
+#include <sys/resource.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/time.h>