Thu Oct 31 10:18:18 EDT 2019

faking the nix-build src

I'm still a little confused about how nix-build actually works.  Maybe
not yet completely awake here this morning, but it cannot find scripts
I'm referencing.

The difference between nix-build and nix-shell, is that the former is
executed in a temporary directory which only has the source tree
mentioned in the "src" attribute of the derivation.  So if that is not
set up properly, it is possible that something that works in nix-shell
will not work in nix-build.