let
  basicC = subdir: name: { stdenv }:
    stdenv.mkDerivation {
      inherit name;
      src = ./.;
      buildPhase = ''
        runHook preBuild
        gcc ${subdir}/${name}.c -o ${name}.bin
        runHook postBuild
      '';
      installPhase = ''
        runHook preInstall
        mkdir -p $out/bin
        install ${name}.bin $out/bin/${name}
        runHook postInstall
      '';
    };
in {
  p1-phase1 = basicC "phase1" "phase1";
  p1-phase2 = basicC "phase2" "phase2";
  p1-phase3 = basicC "phase3" "phase3";
  p1-phase4 = basicC "phase4" "phase4";
}