[exim] simplest pwcheck hack for freebsd

i am a freebsd -current and portupgrade used

what is the *simplest* and most maintainable way to include
pwcheck into exim's portupgrade build?

randy

---

begin authenticators

plain:
    driver = plaintext
    public_name = PLAIN
    server_advertise_condition = ${if eq{$tls_cipher}{}{no}{yes}}
    server_condition = "${if pwcheck{$2:$3}{1}{0}}"

login:
    driver = plaintext
    public_name = LOGIN
    server_advertise_condition = ${if eq{$tls_cipher}{}{no}{yes}}
    server_condition = "${if pwcheck{$2:$3}{1}{0}}"