Updates not occuring, manual update errors out

[les]

Hi, everyone,
	I thought I saw this go by on someone else's dime, but I can't find the
requisite thread now.  Googling did not help me. Here is the error
message:
==========================================
Error: Package: clang-2.9-6.fc16.x86_64 (@updates)
           Requires: gcc-c++ = 4.6.2
           Removing: gcc-c++-4.6.2-1.fc16.x86_64
(@koji-override-0/$releasever)
               gcc-c++ = 4.6.2-1.fc16
           Updated By: gcc-c++-4.6.3-2.fc16.x86_64 (updates)
               gcc-c++ = 4.6.3-2.fc16
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest
==========================================

The first doesn't change the error message, nor finish the update.
the second hums away for a bit but no issues seem to arise and no
messages:
=================================
# rpm -Va --nofiles --nodigest
#
================================

I tried yum clean all just to make sure there was no other issue
clouding the results, but everything seems OK.  What does this
(@koji-override-0/$releasever) bit actually mean anyway?

Regards,
Les H