crypt function undeclared!!!

[Ivan Hernandez]

hello, i'm trying to compile some anti-spamm SMTP reverse proxy that i 
have used on linux Debian on cygwin and it says that crypt function is 
undeclared. Someone must have found the same problem before, and would 
know the right action in order to make it work correctly.
Please, give me more indications, i searched google on "cygwin, crypt 
funcion undeclared" but i have found just some old garbage about 
obsoleted ports od postgresql.
Thanks you for all!
Ivan Hernandez, from Argentina

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