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 247351 [details]
+*iax-0.2.2-r2 (13 May 2014)
+ 13 May 2014; Tony Vroon <firstname.lastname@example.org> +iax-0.2.2-r2.ebuild,
+ Stop trying to tiptoe around the autotools eclass and just use it correctly.
+ This instills LDFLAGS respect, which was flagged up by Diego Elio "Flameeyes"
+ Pettenò in bug #337357.