default.nix

with import <nixpkgs> {};

stdenv.mkDerivation rec {
  name = "pkgname";
  version = "0.1";
  outputHashMode = "recursive";
  outputHashAlgo = "sha256";
  outputHash = "133s7c6kmjc5mpnacx5dssx8mix61wn767hh0nydwaaxpar2m3zj"; # dummy, trying to obtain the real value by building the derivation
  phases = ["installPhase"];
  src = ./directory;
  files = [
    "file1"
    "file2"
  ];

  installPhase = lib.concatMapStrings (file: ''
    install -Dm755 "$src/${file}" "$out/${file}"
  '') files;
}