From 3c1e29db9ff7dc2edbbdf11435a5925f83954ac5 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Thu, 22 Mar 2018 16:51:03 +0000
Subject: [PATCH] Moved OPENGL_INCLUDE_DIR include into it's own
 INCLUDE_DIRECTORIES(SYSTEM ${OPENGL_INCLUDE_DIR}) entry to help with FreeBSD
 builds where a previous rev of the OSG has already been installed

---
 CMakeLists.txt | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index bf1b3eb5f..19fb4d489 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -330,16 +330,15 @@ IF(UNIX AND NOT ANDROID)
 
 ENDIF()
 
-INCLUDE_DIRECTORIES(
-    ${OpenSceneGraph_SOURCE_DIR}/include
-    ${OPENGL_INCLUDE_DIR}
-)
+INCLUDE_DIRECTORIES(${OpenSceneGraph_SOURCE_DIR}/include/)
 
 # Make the headers visible to everything
 IF(NOT ${PROJECT_BINARY_DIR} EQUAL ${PROJECT_SOURCE_DIR})
    INCLUDE_DIRECTORIES(${PROJECT_BINARY_DIR}/include)
 ENDIF()
 
+INCLUDE_DIRECTORIES(SYSTEM ${OPENGL_INCLUDE_DIR})
+
 # Common global definitions
 #ADD_DEFINITIONS(-D)
 # Platform specific definitions