Help Building PostgreSQL on Solaris

I am trying to compile postgres on solaris 7. After running the configure
script and then the make I get the following error...

/home/eccdev/kzorgdra/tmp/postgresql-7.1.3>make
make -C doc all
make[1]: Entering directory `/home/eccdev/kzorgdra/tmp/postgresql-7.1.3/doc'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/eccdev/kzorgdra/tmp/postgresql-7.1.3/doc'
make -C src all
make[1]: Entering directory `/home/eccdev/kzorgdra/tmp/postgresql-7.1.3/src'
make -C backend all
make[2]: Entering directory
`/home/eccdev/kzorgdra/tmp/postgresql-7.1.3/src/backend'
make -C access all
make[3]: Entering directory
`/home/eccdev/kzorgdra/tmp/postgresql-7.1.3/src/backend/access'
make -C common SUBSYS.o
make[4]: Entering directory
`/home/eccdev/kzorgdra/tmp/postgresql-7.1.3/src/backend/access/common'
gcc -O2 -funroll-loops -fexpensive-optimizations -I/usr/local/include -Wall
-Wmissing-prototypes -Wmissing-declarations
/../src/include -O2 -funroll-loops -fexpensive-optimizations -I/usr/local/in
clude -c -o heaptuple.o heaptuple.c
/usr/ccs/bin/as: "/var/tmp/ccLq9TVj.s", line 806: error: unknown opcode
".subsection"
/usr/ccs/bin/as: "/var/tmp/ccLq9TVj.s", line 806: error: statement syntax
/usr/ccs/bin/as: "/var/tmp/ccLq9TVj.s", line 816: error: unknown opcode
".previous"
/usr/ccs/bin/as: "/var/tmp/ccLq9TVj.s", line 816: error: statement syntax
make[4]: *** [heaptuple.o] Error 1
make[4]: Leaving directory
`/home/eccdev/kzorgdra/tmp/postgresql-7.1.3/src/backend/access/common'
make[3]: *** [common-recursive] Error 2
make[3]: Leaving directory
`/home/eccdev/kzorgdra/tmp/postgresql-7.1.3/src/backend/access'
make[2]: *** [access-recursive] Error 2
make[2]: Leaving directory
`/home/eccdev/kzorgdra/tmp/postgresql-7.1.3/src/backend'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/home/eccdev/kzorgdra/tmp/postgresql-7.1.3/src'
make: *** [all] Error 2

Thanks.

Kelby