diff -ruN busybox-1.17.3/shell/shell_common.c busybox-1.17.3-akaros/shell/shell_common.c
--- busybox-1.17.3/shell/shell_common.c	2010-10-09 12:57:14.000000000 -0700
+++ busybox-1.17.3-akaros/shell/shell_common.c	2014-12-17 14:49:41.806851620 -0800
@@ -18,6 +18,7 @@
  */
 #include "libbb.h"
 #include "shell_common.h"
+#include <sys/resource.h>
 
 const char defifsvar[] ALIGN1 = "IFS= \t\n";