mod_dav+mod_ssl+php3.0.16

I'm getting an undefined symbol when trying to run Apache after installing all these components (mod_ssl, then mod_dav, then php3) using apxs. The undefined symbol is "dav_api_set_request_handler", which is referenced in functions/dav.c. It does not appear in a grep of the mod_dav sources. The weird part is, I didn't have this problem until I put in mod_ssl, though it's completely baffling to me as to why it wouldn't have shown up before (since the symbol isn't in mod_dav). Can't find it in the apache source either (pre- or post- mod_ssl eapi). Can someone clue me in on the problem here? Lynn