Update CMakeLists.txt

Enable c++11 support manually by using the compiler flags.

CMakeLists.txt

@@ -70,10 +70,12 @@ if((CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX) AND NOT CMAKE_COMPILER_
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")
   endif()
   # hide all not-exported symbols
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden -Wall" )
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden -Wall -std=c++0x" )
 elseif(MSVC)
   # enable multi-core compilation with MSVC
   add_compile_options(/MP)
+elseif ( "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang" )
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden -Wall -Wno-long-long -pedantic -std=c++11" )
 endif()
 
 INCLUDE (FindPkgConfig)