From 82505ef8f6723459954bf7f29b1cc11dca396a46 Mon Sep 17 00:00:00 2001
From: Clement Champetier <cl.champetier@gmail.com>
Date: Sun, 21 Sep 2014 14:09:00 +0200
Subject: [PATCH] CMake avplay: do not build the app if OpenGL or GLUT are not
 found

* Print a warning if avplay app can't be built.
* Allow the user to build avTranscoder library even if dependencies of
this app are not found.
* fix #94
---
 app/cpp/avplay/CMakeLists.txt | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/app/cpp/avplay/CMakeLists.txt b/app/cpp/avplay/CMakeLists.txt
index 61a1838b..2af5cf36 100644
--- a/app/cpp/avplay/CMakeLists.txt
+++ b/app/cpp/avplay/CMakeLists.txt
@@ -4,10 +4,21 @@
 set(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
 include(AvTranscoderMacros)
 
-# Build app
-find_package(OpenGL REQUIRED)
-find_package(GLUT REQUIRED)
+# Check OpenGL
+find_package(OpenGL)
+if(NOT OPENGL_FOUND)
+	message("OpenGL not found, will not build avplay app.")
+	return()
+endif()
+
+# Check GLUT
+find_package(GLUT)
+if(NOT GLUT_FOUND)
+	message("GLUT not found, will not build avplay app.")
+	return()
+endif()
 
+# Build app
 include_directories(${AVTRANSCODER_SRC_PATH} ${FFMPEG_INCLUDE_DIR})
 include_directories( ${OPENGL_INCLUDE_DIRS}  ${GLUT_INCLUDE_DIRS} )