anchor.diff:  
     postInstall = ''
       mkdir -p $out/include/keyfinder
  -    cp *.h $out/include/keyfinder
  +    install -m644 *.h $out/include/keyfinder
  +    mkdir -p $out/lib
  +    cp -a lib*.so* $out/lib
     '';
   }
  
positive.code:   };
  
    buildInputs = [ fftw qt5.base ];
    propagatedBuildInputs = [ boost ];
  
    patchPhase = ''
      substituteInPlace LibKeyFinder.pro --replace "/usr/local" "$out"
    '';
  
    configurePhase = ''
  
negative.code: { stdenv, fetchFromGitHub, fftw, qt5 }:
  
  let version = "2.1"; in
  stdenv.mkDerivation {
    name = "libkeyfinder-${version}";
  
    src = fetchFromGitHub {
      sha256 = "07kc0cl6kirgmpdgkgmp6r3yvyf7b1w569z01g8rfl1cig80qdc7";
      rev = "v${version}";
      repo = "libKeyFinder";
      owner = "ibsh";
  