Troubles with libsasl package

tryed to setup postfix sasl to auth to ldap with cyrus-sasl:

smtpd.conf:
> pwcheck_method: auxprop
> auxprop_plugin: ldapdb
> mech_list: PLAIN LOGIN CRAM-MD5 DIGEST-MD5 NTLM
> ldapdb_uri: ldap://openldap
> ldapdb_id: postfix
> ldapdb_pw: test
> ldapdb_mech: DIGEST-MD5

and found that there is no **libldapdb.so** in [libldap](https://pkgs.alpinelinux.org/contents?branch=v3.8&name=libsasl&arch=x86_64&repo=main) package; no package [cyros-sasl-ldapdb](https://pkgs.alpinelinux.org/packages?name=cyrus-sasl*&branch=v3.8&arch=x86_64) package available; and also found this https://git.alpinelinux.org/cgit/aports/tree/main/cyrus-sasl/APKBUILD - it does not look like cyrus-sasl was built with ldap support...

am i doing something wrong?
is there any known way to ldapdb cyrus-sasl module into alpine? (compile from source or maybe it is a part of any other package?)

--
also, what is a reason disabling anon module?

> ./configure \
> --build=$CBUILD \
> --host=$CHOST \
> --prefix=/usr \
> --sysconfdir=/etc \
> --localstatedir=/var \
> **--disable-anon \**
> --enable-cram \
> --enable-digest \
> --enable-login \
> --enable-ntlm \
> --disable-otp \
> --enable-plain \
> --with-gss_impl=heimdal \
> --with-devrandom=/dev/urandom \
> --without-ldap \
> --with-saslauthd=/var/run/saslauthd \
> --mandir=/usr/share/man \