unixODBC and postgresql83 are incompatible

[Chris Waterson]

It turns out that postgresql83 can't be installed with unixODBC  
present, since unixODBC has a file called "sqltypes.h".  It seems  
like the postgresql83 build ought to be fixed to ensure that it looks  
in build-local directories for include files before looking in /opt/ 
local/include.

(Sorry to be lazy, and not provide a patch -- since I'm not using  
unixODBC, I just uninstalled it and postgresql83 built fine.)

chris