anchor.diff:    libX11, libXinerama, libXrandr, libGLU, libGL,
     glib, ilmbase, libxml2, pcre, zlib,
     AGL, Carbon, Cocoa, Foundation,
  +  boost,
     jpegSupport ? true, libjpeg,
     exrSupport ? false, openexr,
     gifSupport ? true, giflib,
  
positive.code:     ++ lib.optional tiffSupport libtiff
      ++ lib.optional gdalSupport gdal
      ++ lib.optional curlSupport curl
      ++ lib.optional colladaSupport opencollada
      ++ lib.optional opencascadeSupport opencascade
      ++ lib.optional ffmpegSupport ffmpeg
      ++ lib.optional nvttSupport nvidia-texture-tools
  
negative.code:   tiffSupport ? true, libtiff,
    gdalSupport ? false, gdal,
    curlSupport ? true, curl,
    colladaSupport ? false, collada-dom,
    opencascadeSupport ? false, opencascade,
    ffmpegSupport ? false, ffmpeg,
    nvttSupport ? false, nvidia-texture-tools,
  