Thanks for the Guix info, as I say I've not really used it. The use of "phases", etc. is what I was getting at w.r.t. Nix's complicated "autoconf/automake suppo

Thanks for the Guix info, as I say I've not really used it. The use of "phases", etc. is what I was getting at w.r.t. Nix's complicated "autoconf/automake support" (AKA `stdenv.mkDerivation`). As you say, Guix's use of Scheme rather than stiching shell scripts together should be more powerful (in particular, concatenating strings of bash results in a rather opaque builder; whilst a more declarative s-expression approach would make traversing and modifying the builder more feasible)