From a5c019ee1b5b780e4ce90f23b4b7980305997576 Mon Sep 17 00:00:00 2001
From: Emmanuele Bassi <ebassi@gnome.org>
Date: Thu, 4 Oct 2018 21:59:34 +0100
Subject: Ensure Autotools enables EGL-X11 support

The X11 support in the Autotools build is missing the definition of the
ENABLE_X11 pre-processor symbol. Without it, we're missing the X11
platform definitions for EGL.

Fixes #188
---
 configure.ac | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/configure.ac b/configure.ac
index 3237858..1d0eb27 100644
--- a/configure.ac
+++ b/configure.ac
@@ -157,6 +157,8 @@ if test x$enable_x11 = xno; then
         AC_MSG_ERROR([GLX support is explicitly enabled, but X11 was disabled])
     fi
     build_glx=no
+else
+    AC_DEFINE([ENABLE_X11], [1], [Whether X11 support is enabled])
 fi
 
 AM_CONDITIONAL(BUILD_EGL, test x$build_egl = xyes)
-- 
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