From f955b2255d447d4e6edd7b5f0a01032f443bc7d7 Mon Sep 17 00:00:00 2001
From: Ahmad Fatoum <ahmad@a3f.at>
Date: Sat, 27 Jan 2018 14:50:04 +0100
Subject: [PATCH] GLFW: Fix build error on Linux < v2.6.39

Cherry-pick from upstream glfw/glfw#1196
Found in CPANtesters test of Alien::raylib:
http://www.cpantesters.org/cpan/report/d956d128-0339-11e8-b0d1-b6c4abd39192
---
 src/external/glfw/src/linux_joystick.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/external/glfw/src/linux_joystick.c b/src/external/glfw/src/linux_joystick.c
index d73961fb6..da6a1be70 100644
--- a/src/external/glfw/src/linux_joystick.c
+++ b/src/external/glfw/src/linux_joystick.c
@@ -38,6 +38,10 @@
 #include <string.h>
 #include <unistd.h>
 
+#ifndef SYN_DROPPED // < 2.6.39 kernel headers
+#define SYN_DROPPED 3
+#endif
+
 // Apply an EV_KEY event to the specified joystick
 //
 static void handleKeyEvent(_GLFWjoystick* js, int code, int value)