nixpkgs/pkgs/applications/misc/hello/ex-2/default.nix

{stdenv, fetchurl}:

stdenv.mkDerivation {
  name = "hello-2.3";
  
  src = fetchurl {
    url = mirror://gnu/hello/hello-2.3.tar.bz2;
    sha256 = "0c7vijq8y68bpr7g6dh1gny0bff8qq81vnp4ch8pjzvg56wb3js1";
  };
  
  meta = {
    description = "A program that produces a familiar, friendly greeting";
    longDescription = ''
      GNU Hello is a program that prints "Hello, world!" when you run it.
      It is fully customizable.
    '';
    homepage = http://www.gnu.org/software/hello/manual/;
    license = "GPLv3+";
  };
}