Sat Nov 18 22:08:17 EST 2017

Packages and deps

So, adding package on top of nixpkg is simple.  But how to do 2
packages, with one depending on the other?

They are just derivations.

The easiest way is probably to have them refer each other by path, and
have a top file that contains and builds the leaf derivations.

It is the build of the deriviations that gets cached.