See attached build log.
(Please do not complain about the need for looking at the build log until you can provide an easy way to open bugs with the correct data picked out of a tinderbox log. Thanks.)
Created attachment 244685 [details]
> 14 Dec 2014; Sergei Trofimovich <firstname.lastname@example.org> +ffcall-1.10-r5.ebuild:
> Respect CFLAGS/LDFLAGS (bug #334581), mark noexecstack (bug #253963). Thanks
> to w0rm for the report.