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 245599 [details] Build log
+*xcalendar-4.0-r1 (01 Sep 2010) + + 01 Sep 2010; Kacper Kowalik <xarthisius@gentoo.org> + +xcalendar-4.0-r1.ebuild, +files/xcalendar-4.0-implicits.patch: + Respect CC,CFLAGS,LDFLAGS. Fixes bug 335520. Thanks to Diego for the + report. Fix multilib paths and implicit functions declarations. Add + missing dependency on x11-misc/gccmakedep +