Sys::Utmp provides a vaguely object oriented interface to the Unix user accounting file (sometimes /etc/utmp or /var/run/utmp). Whilst it would prefer to use the getutent() function from the systems C libraries it will attempt to provide its own if they are missing. This may not be the module that you are looking for - there is a User::Utmp which provides a different procedural interface and may well be more complete for your purposes.
Binary packages can be installed with the high-level tool pkgin (which can be installed with pkg_add) or pkg_add(1) (installed by default). The NetBSD packages collection is also designed to permit easy installation from source.
The pkg_admin audit command locates any installed package which has been mentioned in security advisories as having vulnerabilities.
Please note the vulnerabilities database might not be fully accurate, and not every bug is exploitable with every configuration.
Problem reports, updates or suggestions for this package should be reported with send-pr.