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eigen3.cmake
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			set(_working_dir ${PROJECT_BINARY_DIR}/third-party/src/eigen3-download)
			configure_file(${PROJECT_SOURCE_DIR}/third-party/eigen3.cmake.in ${_working_dir}/CMakeLists.txt)

			if(NOT EXISTS ${PROJECT_SOURCE_DIR}/third-party/eigen3/CMakeLists.txt)
			message(STATUS "Downloading eigen3")
			execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
			RESULT_VARIABLE result WORKING_DIRECTORY ${_working_dir}
			OUTPUT_FILE ${_working_dir}/configure-out.log
			ERROR_FILE ${_working_dir}/configure-error.log)

			execute_process(COMMAND "${CMAKE_COMMAND}" --build .
			WORKING_DIRECTORY ${_working_dir}
			OUTPUT_FILE ${_working_dir}/build-out.log
			ERROR_FILE ${_working_dir}/build-error.log)
			endif()

			set(CMAKE_BUILD_TYPE Release)
			set(BUILD_TESTING OFF CACHE BOOL "Eigen Tests" FORCE)

			add_subdirectory(${PROJECT_SOURCE_DIR}/third-party/eigen3)

			set(EIGEN3_LIBRARIES Eigen3::Eigen)
			package_set_libraries(Eigen3 ${EIGEN3_LIBRARIES})

			mask_package_options(EIGEN3)
			mask_package_options(EIGEN)
			mask_package_options(PASTIX)
			mark_as_advanced(
			BUILD_TESTING
			INCLUDE_INSTALL_DIR
			PKGCONFIG_INSTALL_DIR
			PATCH_COMMAND
			QT_QMAKE_EXECUTABLE
			RT_LIBRARY
			CMAKEPACKAGE_INSTALL_DIR
			BLA_VENDOR
			)


			include (FindPackageHandleStandardArgs)
			find_package_handle_standard_args(Eigen3
			REQUIRED_VARS EIGEN3_LIBRARIES
			VERSION_VAR EIGEN3_VERSION)