improved…

gbenchmark.cmake.in
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			cmake_minimum_required(VERSION 3.1)

			project(gbenchmark-download NONE)

			include(ExternalProject)

			ExternalProject_Add(gbenchmark
			GIT_REPOSITORY ${GBENCHMARK_GIT}
			GIT_TAG ${GBENCHMARK_VERSION}
			SOURCE_DIR ${PROJECT_SOURCE_DIR}/third-party/google-benchmark
			BINARY_DIR ${PROJECT_BINARY_DIR}/third-party/google-benchmark
			CONFIGURE_COMMAND ""
			BUILD_COMMAND ""
			INSTALL_COMMAND ""
			TEST_COMMAND ""
			)