diff -ur thunderbird-45.5.1.orig/mozilla/xpcom/io/nsLocalFileUnix.cpp thunderbird-45.5.1/mozilla/xpcom/io/nsLocalFileUnix.cpp
--- thunderbird-45.5.1.orig/mozilla/xpcom/io/nsLocalFileUnix.cpp	2016-11-30 12:51:34.000000000 +0200
+++ thunderbird-45.5.1/mozilla/xpcom/io/nsLocalFileUnix.cpp	2016-12-22 20:17:45.709381882 +0200
@@ -28,6 +28,7 @@
 #define USE_LINUX_QUOTACTL
 #include <sys/mount.h>
 #include <sys/quota.h>
+#include <sys/sysmacros.h>
 #ifndef BLOCK_SIZE
 #define BLOCK_SIZE 1024 /* kernel block size */
 #endif