From 97401f843a0b900d113fa3b258b2cd6979faa905 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sat, 28 Jul 2018 23:08:15 +0530
Subject: [PATCH] Sigh. Apparently _XOPEN_SOURCE is needed on older linux
 systems for fileno()

---
 glfw/ibus_glfw.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/glfw/ibus_glfw.c b/glfw/ibus_glfw.c
index fd4af17c9..9e2bb1777 100644
--- a/glfw/ibus_glfw.c
+++ b/glfw/ibus_glfw.c
@@ -24,6 +24,10 @@
 //
 //========================================================================
 
+// _POSIX_C_SOURCE needed for fileno() on Linux systems
+#define _POSIX_C_SOURCE 1
+#include <stdio.h>
+#undef _POSIX_C_SOURCE
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>