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 249934 [details]
Fixed in -r1
*wepdecrypt-0.8-r1 (10 Dec 2010)
10 Dec 2010; Dane Smith <email@example.com> +wepdecrypt-0.8-r1.ebuild,
*Addresses FORTIFY_SOURCE wrt bug 340148 via new patch.
*Fixed respect for jobserver.
*Ebuild cleanup. Moved to EAPI 2. Several QA fixes.