According to RFC4287[1], each entry's <id> tag should be unique. This is not the case for packages.g.o feed - link to a package is used in <id>, for example "http://packages.gentoo.org/package/sys-auth/pam_usb". This causes breakage when there are more entries for one package in the feed (right now, pam_usb). It would be a good idea to add some unique suffix to the <id> string. The URL to relevant packages.g.o page is already in <link> tag, so nothing would be lost here. 1. http://tools.ietf.org/html/rfc4287#section-4.2.6
fixed in git.