Although the documentation files:

  doc/source/tutorials/system-thread-mixed.png
  doc/source/tutorials/system-thread-ordered.png

are created using GIMP, no XCF files are provided since in this case they
wouldn't provide any extra information (and I doubt the files exist anyway).

 -- James Cowgill <james410@cowgill.org.uk>  Thu, 18 Dec 2013 13:44:00 +0000

The Debian documentation package ships some samples that won't run out
of the box. This is because the data files aren't free (and for some
of them it's questionable if it's even allowed to distribute them). To
run these samples you might need to find replacements for the following
files:

  examples/embedding/image.jpg
  examples/extending/image.jpg
  examples/opengl/resources/background.jpg
  examples/opengl/resources/texture.jpg
  examples/pyqt4/data/head_kid.png
  examples/pyqt5/data/head_kid.png
  examples/shader/data/background.jpg
  examples/sound/data/canary.wav
  examples/sound/data/orchestral.ogg
  examples/spacial_music/data/head_kid.png
  examples/spacial_music/data/mario.flac
  examples/spacial_music/data/speaker.gif

 -- James Cowgill <james410@cowgill.org.uk>  Thu, 18 Dec 2013 13:44:00 +0000