Hi Pierre!
I haven't looked closely at your patch, but here is the rule for copy-build-system if I'm not mistaken: the files matching #:include preserve the path relative to the first argument.For instance with this rule ("/source/aaa/" "/target/bbb/" #:include ("foo")) the file /source/aaa/parent/foo is copied to /target/bbb/parent/foo (I haven't tested.) Does that help?
With the same example, I was looking for a way where foo gets copied to as /target/bbb/foo.
Regards, RG.
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