pmerge -av -k =sys-libs/glibc-2.5-r3
 * Resolving...
Traceback (most recent call last):
  File "/usr/bin/pmerge", line 36, in ?
    commandline.main(subcommands)
  File "/usr/lib64/python2.4/site-packages/pkgcore/util/commandline.py", line 401, in main
    exitstatus = main_func(options, out, err)
  File "/usr/lib64/python2.4/site-packages/pkgcore/scripts/pmerge.py", line 458, in main
    formatter.format(op)
  File "/usr/lib64/python2.4/site-packages/pkgcore/ebuild/formatter.py", line 240, in format
    reponr = self.repos.setdefault(op.pkg.repo.location,
AttributeError: 'tree' object has no attribute 'location'