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This issue was proposed for RHEL 6.1 FasTrack but did not get resolved in time.
It has been moved to RHEL 6.2 FasTrack.

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Because of a bug in the brp-python-compile script file, unnecessary /etc/mailman/mm_cfg.pyc and /etc/mailman/mm_cfg.pyo files were generated under certain circumstances. As a result, the Mailman build process could have failed. This update fixes the aforementioned bug by compiling Python script files manually so that the build process no longer fails.

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2011-1275.html