diff -Naur a/include/libbb.h b/include/libbb.h
--- a/include/libbb.h	2011-09-05 19:35:36.000000000 -0700
+++ b/include/libbb.h	2016-09-07 22:07:18.448919508 -0700
@@ -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>