HP-UX 11.0 postgres compile error!

Cannot compile Postgres .7.x with gcc 2.9.6 (OS: HP-UX 11.0).

error messages:

..........
..........
gmake[3]: Entering directory
`/home/download/postgresql-7.0.2/src/backend/access/common'
gcc -I../../../include -I../../../backend -D_REENTRANT -I/usr/local/Berkeley
DB.3.2/include -I/usr/local/src/openldap-2.0.14/include -Ddef -O2 -Wall -Wm
issing-prototypes -Wmissing-declarations -I../.. -D_REENTRANT -I/usr/local/B
erkeleyDB.3.2/include -I/usr/local/src/openldap-2.0.14/include -Ddef -c -o
indexvalid.o indexvalid.c
In file included from ../../../include/nodes/print.h:17,
from ../../../include/executor/execdebug.h:17,
from indexvalid.c:19:
../../../include/nodes/parsenodes.h:103: parse error before `1'
../../../include/nodes/parsenodes.h:103: warning: no semicolon at end of
struct or union
../../../include/nodes/parsenodes.h:105: parse error before `}'
../../../include/nodes/parsenodes.h:105: warning: type defaults to `int' in
declaration of `AlterTableStmt'
../../../include/nodes/parsenodes.h:105: warning: data definition has no
type or storage class
gmake[3]: *** [indexvalid.o] Error 1
gmake[3]: Leaving directory
`/home/download/postgresql-7.0.2/src/backend/access/common'
gmake[2]: *** [submake] Error 2
gmake[2]: Leaving directory
`/home/download/postgresql-7.0.2/src/backend/access'
gmake[1]: *** [access.dir] Error 2
gmake[1]: Leaving directory `/home/download/postgresql-7.0.2/src/backend'
gmake: *** [all] Error 2

I cannot solve this problem. please give me a solution..

thanks.