F15 preupgrade: lots of uneraseable dupes

[Bruno Wolff III]

On Tue, Oct 11, 2011 at 14:46:42 +0200,
  suvayu ali <fatkasuvayu+linux at gmail.com> wrote:
> 
> I thought yum doesn't do these kind of reverse dependency checks (the
> reason remove-with-leaves is not reliable)? Or are you talking about
> situations when an external package has a hard dependency like this:
> 
> external-1.00 requires = fedora-pkg1-1.00 instead of external-1.00
> requires >= fedora-pkg1-1.00?

It is pretty common for users of libraries to require particular soname
versions.