anchor.diff:  
   , gd
   , libexif
  -, libjpeg
  +, libjpeg-turbo_1-4
   #, libltdl
   , libusb
   , libxml2
  
positive.code:     "--enable-largefile"
      "--disable-internal-docs"
      "--disable-docs"
      (wtFlag "jpeg" (libjpeg != null) null)
      "--with-camlibs=all"
    ];
  
  
negative.code:     license = licenses.gpl2;
      maintainers = with maintainers; [ ];
      platforms = with platforms;
        x86_64-linux;
    };
  }
  