xlock doesn't use crypt automatically

[Cilantro]

xlock doesn't offer the -cpasswd option -- even when recompiled from source.

Steps to reproduce:
    Download source package and dependencies.
    (I used xlockmore_5.31-1.tar.gz.)
Configure and compile; I used:
    ./configure --enable-xlockrc --enable-blank-only
    make
Resulting error message:
    /xlock/passwd.c:1405: undefined reference to `crypt'

After searching online, I found the following fix:
 XLOCKLIBS="-lcrypt"
before compilation does the trick. This should surely happen
automatically when --enable-xlockrc is called explicitly during
compilation. But I regard it as a bug that the -cpasswd feature
documented in the man page doesn't work in the distributed package,
so perhaps this flag should be set by default.

Cilantro