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 252195 [details]
+*molden-5.0 (23 Jun 2012)
+*molden-4.8-r2 (23 Jun 2012)
+ 23 Jun 2012; Justin Lecher <email@example.com> -molden-4.7-r1.ebuild,
+ -molden-4.8.ebuild, -molden-4.8-r1.ebuild, +molden-4.8-r2.ebuild,
+ files/molden-4.8-overflow.patch, +molden-5.0.ebuild,
+ +files/molden-5.0-ambfor.patch, metadata.xml:
+ Fix buffer overflow, #342907; Version Bump, #355741; Fix build failures,
+ #358917, #423015; drop old