The cyrus-sasl package contains a sample directory with examples in C
that demonstrate how to build against libsasldb. These examples
are difficult to build outside the cyrus-sasl tree and offer no value
for the installed package in Gentoo, which is why they are no longer
packaged. If you intend to develop e.g. plugins, please see the upstream
development repository at https://github.com/cyrusimap/cyrus-sasl.