Restrict more clang versions for osg-gtk

Author: sjoelund

backends/osg-gtk/CMakeLists.txt

@@ -4,8 +4,8 @@ find_package(OpenSceneGraph REQUIRED osgGA osgText osgViewer osgDB)
 if(MINGW)
 add_definitions(-std=c++0x -U__STRICT_ANSI__ -mms-bitfields)
 elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
-  if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "3.1")
-    message("clang <3.1 detected; changing to default c++ instead since clang 3.0 is not good enough for the used headers")
+  if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "3.3")
+    message("clang <3.3 detected; changing to default c++ instead since clang 3.0~3.2 are not good enough for the used headers")
     set(CMAKE_CXX_COMPILER c++)
   endif()
 add_definitions(-std=c++0x)