Tests/RunCMake/ExternalData/BadCustom4.cmake - external/github.com/Kitware/CMake - Git at Google

 include(ExternalData)
 set(ExternalData_URL_TEMPLATES
   "ExternalDataCustomScript://RelPathKey/%(algo)/%(hash)"
   )
 set(ExternalData_CUSTOM_SCRIPT_RelPathKey "RelPathScript.cmake")
 ExternalData_Add_Target(Data)
	include(ExternalData)
	set(ExternalData_URL_TEMPLATES
	"ExternalDataCustomScript://RelPathKey/%(algo)/%(hash)"
	)
	set(ExternalData_CUSTOM_SCRIPT_RelPathKey "RelPathScript.cmake")
	ExternalData_Add_Target(Data)