allow to specify full installation path

[dimpase]

This would allow building packages which can be directly installed into a predefined location, such as macOS' /Applications

On macOS in particular this is crucial, as would allow codesigning: on macOS dylibs etc must be blessed with the builders key at buildtime, this makes any sort of file changes upon installation probably just impossible, as one cannot, or should not,
ship keypairs needed for re-signing.

Then one can build the macOS app with codesigning, which is aware of that predefined location, and uses it.

[vbraun]

I think you should just write a separate build script that signs the binary, there isn't really any overlap with the goals here.

[dimpase]

well, I don't understand why one should insist on an extra overhead of rewriting the paths, if the path is known in advance.

rewriting is slow and error-prone, if it can be skipped then it should be skipped.