[postgis-users] using postgis cvs: how to update db?

[Vincent Schut]

If I use (and regularly update and install) postgis from cvs, how should 
I keep my db up to date with the most recent postgis functionality? 
re-issuing the (lw)postgis.sql results in errors because histogram2d 
already exists. Should I use create_undef.pl? If yes, what is exactly 
the command flow to update postgis and the db?

Thanks,
Vincent.