Sounds exactly like you aren't managing to include the definition of the CACHE struct successfully. You'll need to look at the *.c file and perhaps preprocessed output of that and dig around in the headers to figure out why.

I don't think your simple typemap will work either, though. I suppose it might if there is some other function you call to initialize "entry". BTW, I'm not a big fan of T_PTROBJ. I usually prefer to stuff my C structs into Perl strings. But that is a whole 'nother topic. (:

        - tye (but my friends call me "Tye")