>Ubuntu users that want to file a bug, have the choice between three options. They can file a bug upstream, where they might get flamed; they can file a bug in Debian, where they are very likely to get flamed; or they can file a bug in Ubuntu's Launchpad, where there are very likely to get ignored.
Upstream reaction is not just flames.
(a) the D/U shipped version is numerically outside of the support scope (including, but not limited to, the linux kernel)
(b) the shipped version is considered too patch-ed-y
(c) reject option. ("We are sorry we do not officially support $DISTRO && $THEIR_OLD_VERSION")
>Fedora starts them as make %{?_smp_mflags}, while openSUSE uses make %{?jobs:-j%jobs}. And so on.