Re: cargo-build-system: cargo-build-flags: --cfg=unix in package recipe

[Danny Milosavljevic]

> It still can't pick up transitive dependencies but hey :P

Aha! It can - if one uses propagated-inputs in the package recipes. I think the 
importer should propagate inputs if the current package is Rust-source-only. 
Otherwise packages further down the dependency graph (further to the clients) 
won't compile later.