let
  basic-c = name: { stdenv }:
    stdenv.mkDerivation {
      inherit name;
      src = ./.;
      buildPhase = ''
        runHook preBuild
        gcc c-programs/${name}.c -o ${name}
        runHook postBuild
      '';
      installPhase = ''
        runHook preInstall
        mkdir -p $out/bin
        install ${name} $out/bin/
        runHook postInstall
      '';
    };
in {
  assign1-hello = basic-c "hello";
  assign1-employee = basic-c "employee";
}