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Roll up summary using a formula field

I have a custom object "Group" that is linked to Opportunities by the "Group" field on the Opportunity record.  I would like a roll up summary onto the Account record, saying how many opportunities are under that accoun with a certain group value.  I tried to do a boolean formula in the opportunity record, saying whether the opportunity had that group value, but then that formula field won't show on the list of roll up fields.  Is it because the formula is referencing multiple objects (opportunity and group)?  What is the best way to get around that?