[BUGS] postgres in 'C' - can't get started

[Graeme Stobbart]

Red Hat 7, Vanilla install postgres from RPM's   Create very simple program to open/close (cut down vsn of example 1)   Compile using libpq.a   Follwing error...   /usr/lib/libpq.a (fe-auth.a): In function `pg_password_sendauth`: fe-auth.o(.text+0x30): undefined reference to `crypt`   New to postgres, have I missed something?  Reply, however terse, much appreciated. Thanks Tom K