I'm getting this error compiling postgres

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+0x3954): undefined reference to `crypt'
libpq/SUBSYS.o: In function `verify_password':
libpq/SUBSYS.o(.text+0x3b97): undefined reference to `crypt'
make[1]: *** [postgres] Error 1
make[1]: Leaving directory `/usr/src/pgsql/src/backend'
make: *** [all] Error 2

I'm using caldera openlinux 2.3 with gmake 3.77,  egcs-2.91.66, flex  2.5.4,
GNU bison 1.28. if youneed anymore  information contact me.

I hope you can help me.

TIA

Antonio Medeiros

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