How can I update a Git clone that mirrors a CVS repo?

I need to make some changes to Eclipse BIRT. So I cloned the Git repository git://dev.eclipse.org/org.eclipse.birt/org.eclipse.birt.report.engine.git

But this clone doesn't contain the CVS tag BIRT_2_6_2_Release_201102151647

What is an effic开发者_StackOverflow社区ient way to import all the missing CVS revisions into my clone of the Git repo at dev.eclipse.org?

As far as I remember the only tool that supports repeated, incremental synching of git to cvs (and a lot of other VCSes) is Tailor