Error in compilation on hpux10.20

Hi

I'm trying to install PostgreSQL 6.3.2 on hp Station with hpux10.10, but
there is a error occuring during the compilation of pgc.l:

..../....
gmake[3]: Entering directory `/opt/pgsql/src/interfaces/ecpg/preproc'
/opt/bison/bin/bison -y -d preproc.y
cc -I../../../include -I../../../backend   -W l,-E -Ae   -I../include
-DMAJOR_VERSION=1 -DMINOR_VERSION=1 -DPATCHLEVEL=0
-DINCLUDE_PATH=\"/opt/pgsql/include\"   -c y.tab.c -o y.tab.o
lex  -t pgc.l > pgc.c
"pgc.l" line 157: warning 22: Executable statements should occur right
after %%
"pgc.l" line 206: error 3: Parse tree too big, Try using %e num
1000/1000 nodes(%e), 0/2500 positions(%p), 1/500 (%n), 0 transitions,
0/1000 packed char classes(%k), 0/2000 packed transitions(%a), 0/0
output slots(%o)
gmake[3]: *** [pgc.c] Error 1
rm pgc.c
gmake[3]: Leaving directory `/opt/pgsql/src/interfaces/ecpg/preproc'
gmake[2]: *** [all] Error 2
gmake[2]: Leaving directory `/opt/pgsql/src/interfaces/ecpg'
gmake[1]: *** [all] Error 2
gmake[1]: Leaving directory `/opt/pgsql/src/interfaces'
gmake: *** [all] Error 2

Is somebody knows what to do ?
I'm searching a patch, but i see nothing for this!

Thank's a lot.

Jerome Verleyen
INSA, Dpt Genie Mecanique
Complexe Scientifique de Rangueil
31077 Toulouse Cedex 04
Jerome.Verleyen@insa-tlse.fr