'Webpass' configuration

Looking at the source, things are strange:

(1) sqwebmail/auth.c has checks for #if ENABLE_WEBPASS (but it doesn't seem
to be defined anywhere, including any config.h.in)

(2) INSTALL.vchkpw and sqwebmail/ChangeLog refer to "--enable-webpass=no" as
an option, but this does not seem to appear in any configure.in

(3) sqwebmail/config.h.in has #undef WEBPASS_CHANGE_VCHKPW (but it doesn't
seem to be used or tested anywhere)

(4) sqwebmail/configure.in sets WEBPASS_CHANGE_VCHKPW to the contents of the
shell variable $WEBPASS_CHANGE_VCHKPW (but it doesn't seem to be set
anywhere)

Am I missing something? I can't understand how these bits fit together.

Cheers,

Brian.