Problems in pgc.l for hpux 10.20

I have recenntly tried to compile  Postgresql 6.3.1 on a hpux 10.20
machine. Every time I compile it hits the interfaces directory and bails
out with the following:

make[3]: Entering directory
`/hp715i/users/davej/programs/POSTGRES95/v631/postgresql-6.3.1/src/interfaces/ecpg/preproc'

lex   -t pgc.l > pgc.c
"pgc.l" line 236: warning 48: Undefined start condition <EOF
"pgc.l" line 272: error 50: output table overflow, try using %o num
1159/5000 nodes(%e), 5503/6000 positions(%p), 510/100000 (%n), 53300
transitions, 1335/2000 packed char classes(%k), 1898/2000 packed
transitions(%a), 0/0 output slots(%o)
make[3]: *** [pgc.c] Error 1
make[3]: Leaving directory
`/hp715i/users/davej/programs/POSTGRES95/v631/postgresql-6.3.1/src/interfaces/ecpg/preproc'

make[2]: *** [install] Error 2
make[2]: Leaving directory
`/hp715i/users/davej/programs/POSTGRES95/v631/postgresql-6.3.1/src/interfaces/ecpg'

make[1]: *** [install] Error 2
make[1]: Leaving directory
`/hp715i/users/davej/programs/POSTGRES95/v631/postgresql-6.3.1/src/interfaces'

make: *** [install] Error 2

As you can see I have bumped up all the lex settings and in some cases
to the extreme. I have not been able to resolve two things in pgc.l, the
<<EOF>> and a variable YY_BUFFER_STATE.

DOes anyone have an ideas why this does not work on hpux or other
similar platforms...

Thank
D. Johnson
djohnson@maytag-grp.com