modularize…

pybind11.cmake
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			set(_working_dir ${PROJECT_BINARY_DIR}/third-party/src/pybind11-download)
			configure_file(${PROJECT_SOURCE_DIR}/third-party/pybind11.cmake.in ${_working_dir}/CMakeLists.txt)

			if(NOT EXISTS ${PROJECT_SOURCE_DIR}/third-party/pybind11)
			message(STATUS "Downloading pybind11")
			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(PYBIND11_PYTHON_VERSION ${AKANTU_PREFERRED_PYTHON_VERSION})
			add_subdirectory(${PROJECT_SOURCE_DIR}/third-party/pybind11)
			set_property(TARGET pybind11 APPEND
			PROPERTY INTERFACE_SYSTEM_INCLUDE_DIRECTORIES
			$<BUILD_INTERFACE:${PYBIND11_INCLUDE_DIR}>
			$<BUILD_INTERFACE:${PYTHON_INCLUDE_DIRS}>
			$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
			)

			set(pybind11_FOUND TRUE CACHE INTERNAL "" FORCE)
			set(PYBIND11_INCLUDE_DIR "${PYBIND11_INCLUDE_DIR};${PYTHON_INCLUDE_DIRS}" CACHE INTERNAL "")
			set(PYBIND11_LIBRARIES "${PYTHON_LIBRARIES}" CACHE INTERNAL "")

			mask_package_options(PYBIND11)
			mark_as_advanced(USE_PYTHON_INCLUDE_DIR)