Storing object with no "marshal_dump is defined" in session

One of my classes uses the class GSL::Poly. It seems from this error
message that rails won’t let me store it in the session. ANy ideas what
i can do?

(500 Internal Error)
no marshal_dump is defined for class GSL::Poly
/usr/local/lib/ruby/1.8/pstore.rb:348:in `dump’


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