self: super: let
  pkgsDir  = builtins.toString ./../pkgs;
  pkgNames = builtins.attrNames (builtins.readDir pkgsDir);
  myPkgs   = builtins.listToAttrs (map (name: {
    name = name; value = super.callPackage (pkgsDir + "/" + name) {};
  }) pkgNames);

in
  super // myPkgs