default.nix

with import <nixpkgs> {};

let
  cs50 = stdenv.mkDerivation {
    name = "test";
    src = fetchFromGitHub {
      owner = "cs50";
      repo = "libcs50";
      rev = "v8.0.3";
      sha256 = "08fj1ckbv6q8fsyv3x17y73sfnk0x4b3dlfl35637srn36zfk28n";
    };

    buildInputs = [
      asciidoctor
    ];

    buildPhase = ''
      make build
      make hack
    '';

    installPhase = ''
      make install DESTDIR=$out
    '';
  };
in
  stdenv.mkDerivation {
    name = "mything";
    src = ./.;

    buildInputs = [ cs50 ];

    buildPhase = ''
      echo blabla, calling make, whatever
    '';

    installPhase = ''
      echo installing files, blablabla
      touch $out
    '';
  }