Tests/RunCMake/include_external_msproject/CustomConfig.cmake - third_party/github.com/Kitware/CMake - Git at Google

 include_external_msproject(external external.project
                            GUID aaa-bbb-ccc-000)
 set_target_properties(external PROPERTIES
   MAP_IMPORTED_CONFIG_RELEASE        "Custom - Release"
   MAP_IMPORTED_CONFIG_MINSIZEREL     "Custom - MinSizeRel"
   MAP_IMPORTED_CONFIG_RELWITHDEBINFO "Custom - RelWithDebInfo"
 )
	include_external_msproject(external external.project
	GUID aaa-bbb-ccc-000)
	set_target_properties(external PROPERTIES
	MAP_IMPORTED_CONFIG_RELEASE "Custom - Release"
	MAP_IMPORTED_CONFIG_MINSIZEREL "Custom - MinSizeRel"
	MAP_IMPORTED_CONFIG_RELWITHDEBINFO "Custom - RelWithDebInfo"
	)