Emerging media-libs/stk-4.3.1 fails with jack-use-flag enabled; compiles fine with USE="-jack".
Created attachment 243081 [details] build.log
Created attachment 243083 [details] emerge --info
Looks more like GCC 4.4.x failure... + 17 Aug 2010; Samuli Suominen <ssuominen@gentoo.org> + files/stk-4.3.1-gcc44.patch: + Include <cstdio> also for RtAudio.cpp wrt #332873 by Jouni Rinne.