If X brings in Y as an external project, and Y brings in Z as an
external project, is there some way for Y to communicate information
about Z back to X, e.g., some include directory?
My situation is, X doesn't know anything about Z, but needs to be able
to find one of Z's headers. I wish I could add Y as an external project
and then include_directories(${Y_INCLUDE_DIRS}).
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