Comment 9 for bug 686731

FWIW I don't think you should be running 'make images' during a build. The images in the released tarball (or the bazaar branch revision tagged as a release) will be up-to-date.

I'm generally against committing generated files into a source repository, but in this case the images are documenting expected output, as an aid for manual testing, so I want known good versions of them to be present in the repo.

If you want to generate HTML docs for /usr/share/doc/, 'make clean html' will suffice -- it'll copy the png images into _build/html/.