yacc problems

I am getting the following error when trying to build postgres under BSD/OS
3.1 or 4.0.

gmake[2]: Entering directory `/var/src/local/pgsql/src/backend/parser'
/usr/bin/yacc -d gram.y
/usr/bin/yacc: f - maximum table size exceeded
gmake[2]: *** [parse.h] Error 2
gmake[2]: Leaving directory `/var/src/local/pgsql/src/backend/parser'

Has someone sucessfuly built scan.c and parse.h under BSD/OS?

Daniel