modularize…

eigen3.cmake.in
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			cmake_minimum_required(VERSION 3.1)

			project(eigen3-download NONE)

			include(ExternalProject)

			ExternalProject_Add(eigen3
			SOURCE_DIR ${PROJECT_SOURCE_DIR}/third-party/eigen3
			BINARY_DIR ${PROJECT_BINARY_DIR}/third-party/eigen3
			GIT_REPOSITORY ${EIGEN3_GIT}
			GIT_TAG ${EIGEN3_VERSION}
			CONFIGURE_COMMAND ""
			BUILD_COMMAND ""
			INSTALL_COMMAND ""
			TEST_COMMAND ""
			PATCH_COMMAND
			)