From c7a739bef4c20b280523e3362170201ccb4a2960 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Mon, 2 Mar 2020 15:24:10 -0800
Subject: [PATCH] Fixed bug 4643 - Append EGL CFLAGS in CheckOpenGLESX11

Danilo Spinella

EGL need -DMESA_EGL_NO_X11_HEADERS in systems without X11 installed. Make CMake checks import EGL CFLAGS.

Relevant bug: https://bugzilla.libsdl.org/show_bug.cgi?id=4243
---
 cmake/sdlchecks.cmake | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/cmake/sdlchecks.cmake b/cmake/sdlchecks.cmake
index 3b7f82138759d..ee8421fe1e2a8 100644
--- a/cmake/sdlchecks.cmake
+++ b/cmake/sdlchecks.cmake
@@ -757,8 +757,10 @@ macro(CheckOpenGLX11)
 endmacro()
 
 # Requires:
-# - nada
+# - PkgCheckModules
 macro(CheckOpenGLESX11)
+  pkg_check_modules(EGL egl)
+  set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${EGL_CFLAGS}")
   if(VIDEO_OPENGLES)
     check_c_source_compiles("
         #define EGL_API_FB