{ ... }:
let
  nosv = <nosv>;
  ovni = <ovni>;

  getVersion = x: toString (x.shortRev or x.dirtyShortRev or x.lastModified or "unknown");

  pkgs = (import <bscpkgs> {
    overlays = [
      (final: prev: {
        nosv = prev.nosv.overrideAttrs (old: {
          src = nosv;
          version = getVersion nosv;
        });

        ovni = prev.ovni.overrideAttrs (old: {
          src = ovni;
          version = getVersion ovni;
        });
      })
    ];
  });
in
{
  pkgs = { inherit (pkgs) nosv ovni; };
}