Postgres install problem

Hi, Postgres guru,

    I am new to Postgres and just downloaded the source to compile on my
Caldera 2.2.5.  I got a trouble and here is what i did (follwoing the
INTALL file):

Hardware : Pentium 200  with 32M ram, 2.1G HD(Linux partition)

1)Add a new account postgres
2)make dir  /usr/scr/pgsql ;   /usr/local/pgsql and changed
ownership/group to postgres through root
3) cd /usr/src/pgsql and unzipped the source achive
4)cd /usr/src/pgsql/postgres-6.5.3/src and run
    ./configure --with-template=linux_i386 --without-CXX
    make all >make.log 2>&1 &

the make failed (see make.log) !!

make[3]: Leaving directory
`/usr/src/pgsql/postgresql-6.5.3/src/backend/utils/time'
gcc -I../../include -I../../backend   -O2 -mpentium -Wall -Wmissing-prototyp
es -I..    -c fmgrtab.c -o fmgrtab.o
ld -r -o SUBSYS.o fmgrtab.o adt/SUBSYS.o cache/SUBSYS.o error/SUBSYS.o
fmgr/SUBSYS.o hash/SUBSYS.o init/SUBSYS.o misc/SUBSYS.o mmgr/SUBSYS.o
sort/SUBSYS.o time/SUBSYS.o
make[2]: Leaving directory
`/usr/src/pgsql/postgresql-6.5.3/src/backend/utils'
gcc -o postgres access/SUBSYS.o bootstrap/SUBSYS.o catalog/SUBSYS.o
commands/SUBSYS.o executor/SUBSYS.o lib/SUBSYS.o libpq/SUBSYS.o
main/SUBSYS.o parser/SUBSYS.o nodes/SUBSYS.o optimizer/SUBSYS.o
port/SUBSYS.o postmaster/SUBSYS.o regex/SUBSYS.o rewrite/SUBSYS.o
storage/SUBSYS.o tcop/SUBSYS.o utils/SUBSYS.o
../utils/version.o -lnsl -ldl -lm  -export-dynamic
libpq/SUBSYS.o: In function `crypt_verify':
libpq/SUBSYS.o(.text+0x3ca2): undefined reference to `crypt'
libpq/SUBSYS.o: In function `verify_password':
libpq/SUBSYS.o(.text+0x3fba): undefined reference to `crypt'
make[1]: *** [postgres] Error 1
make[1]: Leaving directory `/usr/src/pgsql/postgresql-6.5.3/src/backend'
make: *** [all] Error 2

How can i solve this ?

NB:
I downloaded bison-1.28 and compiled /installed successfully.

I changed Makefile.global to have:
YFLAGS= -y -d
YACC= /usr/local/bin/bison

I also changed Makefile.custom to have
CFLAGS = -mpentium

Any help is much appreciatted .

Peter