--- a/tools/backlight_helper.c.orig	2016-05-12 07:04:59.611969715 +0300
+++ b/tools/backlight_helper.c	2016-05-12 07:05:38.371497062 +0300
@@ -5,6 +5,7 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <errno.h>
+#include <sys/sysmacros.h>
 
 #include <sys/types.h>
 #include <sys/stat.h>