Gentoo's Bugzilla –
Attachment 332660 Details for
Bug 436246>=app-emulation/virtualbox[vboxwebsrv] with >=dev-libs/libxslt-1.1.27 :compilation error:file .../work/VirtualBox-4.2.0/src/VBox/Main/webservice/websrv-wsdl.xsl line 962 element attribute xsl:attribute: The attribute name 'xmlns' is not allowed.