can't build without mx headers

Hi, all !

# pwd
/usr/local/psycopg-1.1.11
#./configure
...
checking PostgreSQL type 
catalog.../usr/include/postgresql/server/catalog/pg_type.h
checking for mxDateTime.h... configure: error: can't build without mx headers

but in my /usr/local/zope/2-6-0/lib/python2.1/site-packages/mx
directory only mxh.h ?

What can I do ?

Thanks, vadim.