Fedora is adding this: Vendor: Fedora Vendor-URL: http://www.fedoraproject.org/ Bugs: https://bugzilla.redhat.com into /etc/dpkg/origins/fedora symlinked to /etc/dpkg/origins/default see https://src.fedoraproject.org/rpms/dpkg/blob/rawhide/f/dpkg.spec#_205 we have to provide a vendor file for gentoo in order to get dpkg-vendor working