Comment 6 for bug 649917

Apparently an /etc/passwd file isn't sufficient - you actually need a nsswitch.conf file and libnss_files for getpwid_r to return something useful.

Updated patch attached. I've tested it locally and confirmed that it suppresses the GLib warning, and the new version has been pushed to my PPA (https://launchpad.net/~broder/+archive/ubuntu-tests) for test building