cd channels/h323; make clean; make install
chan_h323 is not built and installed from the lower level Makefiles,
so you're very probably still using the old module for it, linked
against your old H.323 libs. To be safe, always re-build any external
Asterisk-modules (those not included in the standard build-process)
after a CVS-update and re-build of Asterisk itself.
Grtz,
Oliver