Cross compiling in general

[Ericson2314]

Hey, you might be interested in the first few commits of https://github.com/NixOS/nixpkgs/pull/13074/commits, which I tried to write to benefit cross-compilers besides GHCJS.

[cstrahan]

I too would be interested in seeing this moved into Nixpkgs, and would be willing to help in any way.

[wavewave]

@Ericson2314 @cstrahan Thanks! To be a part of the official nixpkgs is the final goal of this project. I am referring to your work and start landing this on the upstream. Stay tuned.