fixed cmake problem with gcc

Author: Ironbell

CMakeLists.txt

@@ -45,7 +45,9 @@ if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR CMAKE_CXX_COMPILER_ID MATCHES "GNU"
         message(FATAL_ERROR "Unsupported compiler. At least C++11 support is required.")
     endif()
 
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
+	if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
+	endif()
 endif()
 
 file(GLOB_RECURSE Cendric_FILES