A simple: cp config/jdk-defaults-x86-fbsd.conf config/jdk-defaults-amd64-fbsd.conf at the end of src_prepare does the trick. I'll commit that soon if nobody objects but you might want to fix it in your repo too. without it, if fails because it cannot find config/jdk-defaults-${ARCH}.conf
Added to trunk and ebuild. 10 May 2012; Ralph Sennhauser <sera@gentoo.org> java-config-2.1.11-r3.ebuild: Backport missing jdk-defaults.conf for arm #305773 and amd64-fbsd #415397 Thanks.