{
  stdenv
}:
let
  source = "src/hello.c";
  exec = "hello";
in stdenv.mkDerivation {
  pname = "hello";
  version = "0.1";
  src = ./.;

  buildPhase = ''
    runHook preBuild
    gcc ${source} -o ${exec}.bin
    runHook postBuild
  '';
  installPhase = ''
    runHook preInstall
    mkdir -p $out/bin
    install ${exec}.bin $out/bin/${exec}
    runHook postInstall
  '';
}