another-take…

FindSphinx.cmake
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			find_program(SPHINX_BUILD_EXECUTABLE
			NAMES sphinx-build)

			if(SPHINX_BUILD_EXECUTABLE)
			execute_process(
			COMMAND ${SPHINX_BUILD_EXECUTABLE} --version
			OUTPUT_VARIABLE SPHINX_VERSION
			)

			string(REPLACE "sphinx-build" "" SPHINX_VERSION "${SPHINX_VERSION}")
			string(STRIP "${SPHINX_VERSION}" SPHINX_VERSION)
			endif()

			include(FindPackageHandleStandardArgs)
			find_package_handle_standard_args(Sphinx
			REQUIRED_VARS SPHINX_BUILD_EXECUTABLE
			VERSION_VAR SPHINX_VERSION
			)

			mark_as_advanced(SPHINX_BUILD_EXECUTABLE)