anchor.diff:      if stdenv.isDarwin then
         with darwin.apple_sdk.frameworks; [ GLUT OpenGL ]
       else
  -      [ freeglut libGLU ]
  +      [ freeglut-mupdf libGLU ]
     )
     ;
     outputs = [ "bin" "dev" "out" "man" "doc" ];
  
positive.code:   openJpegVersion = with stdenv;
      lib.versions.majorMinor (lib.getVersion openjpeg);
  
  
  in
  stdenv.mkDerivation rec {
  
negative.code: , lib
  , fetchurl
  , fetchpatch
  , fetchFromGitHub
  , copyDesktopItems
  , makeDesktopItem
  , desktopToDarwinBundle
  