anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "swaylock-effects";
  -  version = "1.6-3";
  +  version = "unstable-2021-10-21";
   
     src = fetchFromGitHub {
       owner = "mortie";
       repo = "swaylock-effects";
  -    rev = "v${version}";
  -    sha256 = "sha256-71IX0fC4xCPP6pK63KtvDMb3KoP1rw/Iz3S7BgiLSpg=";
  +    rev = "a8fc557b86e70f2f7a30ca9ff9b3124f89e7f204";
  +    sha256 = "sha256-GN+cxzC11Dk1nN9wVWIyv+rCrg4yaHnCePRYS1c4JTk=";
     };
  -
  -  patches = [
  -    (fetchpatch {
  -      url = "https://github.com/mortie/swaylock-effects/commit/dfff235b09b475e79d75a040a0307a359974d360.patch";
  -      sha256 = "t8Xz2wRSBlwGtkpWZyIGWX7V/y0P1r/50P8MfauMh4c=";
  -    })
  -  ];
   
     postPatch = ''
       sed -iE "s/version: '1\.3',/version: '${version}',/" meson.build
  
positive.code:     inherit (src.meta) homepage;
      license = licenses.mit;
      platforms = platforms.linux;
      maintainers = with maintainers; [ gnxlxnxx ];
    };
  }
  
negative.code: { lib
  , stdenv
  , fetchFromGitHub
  , meson
  , ninja
  , pkg-config
  