Makefiles and dub

[Anonymouse]

[#20699](https://issues.dlang.org/show_bug.cgi?id=20699) must be 
non-trivial to fix, so I'm exploring makefiles. If possible I'd 
like to keep dub for dependency management though, just not for 
actual compilation.

Is it at all possible (or even desireable) to construct a 
makefile that builds dependencies from outside of the source tree 
(namely 
`$HOME/.dub/packages/package_with_unknown_version-1.2.[0-9]+/`)?

Does anyone have an example `Makefile` I could dissect?

Thanks.