How to apply this patch to redmen1.2?

I got the same problem as the link said but do not know how to apply the patch in squeeze.
http://www.redmine.org/issues/8588

Could anybody help me?
Thanks

Alternative way: you can delete rake >= 0.9 and install rake 0.8.7 and you have no problem.

Rake -V shows 0.8.7 installed through aptitude.
There is no anything in /var/lib/gems/1.8/gems/

My OS was upgraded from lenny.

To apply patch u must add string

require 'rake/dsl_definition'

to the Rakefile into u redmine directory.

Thank you very much.

Hugo

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