--- xf86-video-intel-e6a4c4740c15ace9dd79dc7c18955f2eb413a6a5/tools/backlight_helper.c.orig
+++ xf86-video-intel-e6a4c4740c15ace9dd79dc7c18955f2eb413a6a5/tools/backlight_helper.c
@@ -9,6 +9,7 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <errno.h>
+#include <sys/sysmacros.h>
 
 #include <sys/types.h>
 #include <sys/stat.h>