a11y/colorchooser test failure
b26cdd6d doesn't work on current Debian and Ubuntu.
Full build log at https://buildd.debian.org/status/fetch.php?pkg=gtk%2B3.0&arch=amd64&ver=3.24.2-1&stamp=1544678001
(I accidentally had tests disabled when I did my local build before uploading to Debian).