From cb694d6595c78767874baf021096cc217858c85b Mon Sep 17 00:00:00 2001
From: Sergey Sharybin <sergey.vfx@gmail.com>
Date: Tue, 22 Nov 2016 12:43:59 +0100
Subject: GLog: Workaround compilation error on Hurd

There is syscall headers but no SYS_Write syscall.
---
 extern/glog/src/raw_logging.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/extern/glog/src/raw_logging.cc b/extern/glog/src/raw_logging.cc
index 7a7409bbf34..8517129fa81 100644
--- a/extern/glog/src/raw_logging.cc
+++ b/extern/glog/src/raw_logging.cc
@@ -59,7 +59,8 @@
 # include <unistd.h>
 #endif
 
-#if defined(HAVE_SYSCALL_H) || defined(HAVE_SYS_SYSCALL_H)
+// Hurd does not have SYS_write.
+#if (defined(HAVE_SYSCALL_H) || defined(HAVE_SYS_SYSCALL_H)) && !defined(__GNU__)
 # define safe_write(fd, s, len)  syscall(SYS_write, fd, s, len)
 #else
   // Not so safe, but what can you do?
-- 
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