You're receiving this bug because the package in Summary has produced _FORTIFY_SOURCE related warnings indicating the presence of a sure overflow in a static buffer.
Even though this is not always an indication of a security problem it might even be. So please check this out ASAP.
By the way, _FORTIFY_SOURCE is disabled when you disable optimisation, so don't try finding out the cause using -O0.
Your friendly neighborhood tinderboxer
Created attachment 250447 [details]
+*pavuk-0.9.36_pre20120215 (16 Feb 2012)
+ 16 Feb 2012; Pacho Ramos <email@example.com> +pavuk-0.9.36_pre20120215.ebuild,
+ -files/pavuk-0.9.34-gcc43.patch, -files/pavuk-0.9.34-nls.patch,
+ -pavuk-0.9.34-r1.ebuild, -pavuk-0.9.34-r2.ebuild, metadata.xml:
+ Version bump with latest upstream snapshot including tons of bugfixes, this
+ also solves bug #262504 (adding a gtk2 gui) and buffer overflow problems (bug
+ #340833). Thanks a lot to Richard Grenville, dE, Andreas Klauer and D_W.
+ Remove old and broken buggy versions.