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cxx11.cmake
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			# check for a c++11 compiler flag

			# to set the flag, set the variable CXX11_FLAG

			include(CheckCXXCompilerFlag)

			if(NOT CXX11_FLAG)
			check_cxx_compiler_flag("-std=c++11" HAS_CXX11)
			if(NOT HAS_CXX11)
			message(FATAL_ERROR "A c++11 compatible compiler is necessary")
			else()
			set(CXX11_FLAG "-std=c++11" CACHE INTERNAL "The C++11 flag")
			endif()
			endif()