improved…

iohelper.cmake
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			if(NOT EXISTS ${PROJECT_SOURCE_DIR}/third-party/${IOHELPER_ARCHIVE})
			set(_iohelper_download_command
			GIT_REPOSITORY ${IOHELPER_GIT}
			GIT_TAG ${IOHELPER_VERSION}
			)
			else()
			set(_iohelper_download_command
			URL ${PROJECT_SOURCE_DIR}/third-party/${IOHELPER_ARCHIVE}
			)
			endif()

			if(CMAKE_VERSION VERSION_GREATER 3.1)
			set(_extra_options
			UPDATE_DISCONNECTED 1
			DOWNLOAD_NO_PROGRESS 1
			EXCLUDE_FROM_ALL 1
			)
			endif()

			ExternalProject_Add(iohelper
			PREFIX ${PROJECT_BINARY_DIR}/third-party
			${_iohelper_download_command}
			${_extra_options}
			CMAKE_ARGS <SOURCE_DIR>/
			CMAKE_CACHE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR> -DCMAKE_BUILD_TYPE:STRING=${CMAKE_BUILD_TYPE} -DCMAKE_CXX_COMPILER:PATH=${CMAKE_CXX_COMPILER}
			LOG_DOWNLOAD 1
			LOG_CONFIGURE 1
			LOG_BUILD 1
			LOG_INSTALL 1
			)

			set_third_party_shared_libirary_name(IOHELPER_LIBRARIES iohelper)
			set(IOHELPER_INCLUDE_DIR "${PROJECT_BINARY_DIR}/third-party/include/iohelper" CACHE PATH "IOHelper include directory")

			mark_as_advanced(
			IOHELPER_LIBRARIES
			IOHELPER_INCLUDE_DIR
			)

			package_add_extra_dependency(IOHelper iohelper)