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https://bugzilla.redhat.com/show_bug.cgi?id=634556
--- Comment #3 from Naveen Kumar nkumar@redhat.com 2010-09-21 18:38:34 EDT --- (In reply to comment #2)
Try to use s-c-lang, and then run 'yum groupinstall <LAMG>-support, it will show differences. it should not be "mandatory" only, but works same way as 'yum' doing.
I guess then, this makes it a feature request...