New version 0.4.4 doesn't call "tail -1" anymore and uses "tail -n 1" instead. Latest tail version from Portage outputs warning if -1 is used, and so cvsq-0.4.3 was annoyingly verbose. Normally, renaming the ebuild would suffice, but I'm attaching a patch because cvsq homepage changed since 0.4.3.
Created attachment 32087 [details, diff] cvsq-0.4.4.ebuild.diff
In cvs, thanks for the bug report.