anchor.diff:  , enableGL ? true
   , freeglut
   , libGLU
  +, xcbuild
   }:
   let
   
  
positive.code:     sha256 = "1vfyhlqq1a0k0drcggly4bgsjasmf6lmpfbdi5xcrwdbzkagrbr1";
    };
  
    patches = ./0001-Use-command-v-in-favor-of-which.patch;
  
    postPatch = ''
      sed -i "s/__OPENJPEG__VERSION__/${openJpegVersion}/" source/fitz/load-jpx.c
  
negative.code: 
    nativeBuildInputs = [ pkg-config ];
    buildInputs = [ freetype harfbuzz openjpeg jbig2dec libjpeg gumbo ]
      ++ lib.optional stdenv.isDarwin xcbuild
      ++ lib.optionals enableX11 [ libX11 libXext libXi libXrandr ]
      ++ lib.optionals enableCurl [ curl openssl ]
      ++ lib.optionals enableGL (
  