Index: busybox-1.23.1/include/libbb.h
===================================================================
--- busybox-1.23.1.orig/include/libbb.h
+++ busybox-1.23.1/include/libbb.h
@@ -40,6 +40,7 @@
 #include <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>