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The ExternalProject_Add DEPENDS option adds two types of dependencies. It adds a target-level build order dependency between the external project target and the named targets. It also adds a file-level dependency on the "done" stamp file of the named external project targets. Targets not created by ExternalProject_Add have no such stamp file and no _EP_STAMP_DIR property. Prior to commit d14c0243 (Refactor repeated code into function, 2012-04-26) we unconditionally accepted an empty stamp dir and generated a dependency on a non-existent file. After that commit we generate an error that no stamp dir is set. Skip the file-level dependency when the named dependency is not an external project target in order to allow this use case. Teach the ExternalProject test to cover the case.