swt is about to remove USE=xulrunner wrt bug 409299 for bug 403415, then, please remove the has_version USE check of xulrunner from vuze ebuilds
+ 17 Apr 2012; Samuli Suominen <ssuominen@gentoo.org> vuze-4.5.1.0.ebuild, + vuze-4.6.0.2.ebuild, vuze-4.7.0.0-r1.ebuild, vuze-4.7.0.2.ebuild: + Remove has_version check for dev-java/swt[xulrunner] wrt #409301. Correct + elog message in 4.7.x.x series to say "webkit" instead of "xulrunner".