From 3f99ce540f12a5a440bb17a93634a01b08947789 Mon Sep 17 00:00:00 2001
From: Remo E <remo.eichenberger@gmail.com>
Date: Wed, 29 Mar 2017 15:28:09 +0200
Subject: [PATCH] Fix VS2013 build issue

Fix this build issue on VS2013:

```
\src\osg\State.cpp(99): fatal error C1017: invalid integer constant expression
```

I hope this works also on other platforms.
---
 CMakeLists.txt | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8e9001fd2..bb1493d43 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -593,39 +593,39 @@ ELSE()
 ENDIF()
 
 IF (OSG_GL1_AVAILABLE)
-    SET(OSG_GL1_FEATURES "true")
+    SET(OSG_GL1_FEATURES 1)
 ELSE()
-    SET(OSG_GL1_FEATURES "false")
+    SET(OSG_GL1_FEATURES 0)
 ENDIF()
 
 IF (OSG_GL2_AVAILABLE)
-    SET(OSG_GL2_FEATURES "true")
+    SET(OSG_GL2_FEATURES 1)
 ELSE()
-    SET(OSG_GL2_FEATURES "false")
+    SET(OSG_GL2_FEATURES 0)
 ENDIF()
 
 IF (OSG_GL3_AVAILABLE)
-    SET(OSG_GL3_FEATURES "true")
+    SET(OSG_GL3_FEATURES 1)
 ELSE()
-    SET(OSG_GL3_FEATURES "false")
+    SET(OSG_GL3_FEATURES 0)
 ENDIF()
 
 IF (OSG_GLES1_AVAILABLE)
-    SET(OSG_GLES1_FEATURES "true")
+    SET(OSG_GLES1_FEATURES 1)
 ELSE()
-    SET(OSG_GLES1_FEATURES "false")
+    SET(OSG_GLES1_FEATURES 0)
 ENDIF()
 
 IF (OSG_GLES2_AVAILABLE)
-    SET(OSG_GLES2_FEATURES "true")
+    SET(OSG_GLES2_FEATURES 1)
 ELSE()
-    SET(OSG_GLES2_FEATURES "false")
+    SET(OSG_GLES2_FEATURES 0)
 ENDIF()
 
 IF (OSG_GLES3_AVAILABLE)
-    SET(OSG_GLES3_FEATURES "true")
+    SET(OSG_GLES3_FEATURES 1)
 ELSE()
-    SET(OSG_GLES3_FEATURES "false")
+    SET(OSG_GLES3_FEATURES 0)
 ENDIF()
 
 IF(ANDROID)