crypt() function is not working.????

hi,

I'm doing user authendication in my FTP server..

I used crypt() function to encrypt the user password. So that i
can compare with the encripted password in the database.

but, while executing the program, it shows an error as,

UNDEFINED REFERENCE TO CRYPT() FUNCTION.

But i included "unistd.h"..

what can i do???

please help me..

-Sethu

.

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