Similar to bug #594734, landing of bug #616999 in http://hg.mozilla.org/mozilla-central/rev/40195c0187d3 broke nightly builds on OpenBSD, see :
Errors message starts with :
tar: Link name too long for ustar /var/buildslave-mozilla/mozilla-central-amd64/build/toolkit/mozapps/extensions/test/xpcshell/head_addons.js
bsd tar has a limit of 100 chars in the ustar format, so gtar/$(TAR) should be used instead. I don't know why the commit triggers it now though.
Created attachment 534383 [details] [diff] [review]
Use $(TAR) instead of tar
Fix i'm currently testing, results in a few at http://buildbot.rhaalovely.net/builders/mozilla-central-amd64/builds/43
Build fixed by the aforementioned patch.