The prefork pragma is intended to allow module writers to optimise module loading for both scenarios with as little additional code as possible. The prefork.pm is intended to serve as a central and optional marshalling point for state detection (are we running in procedural or pre-forking mode) and to act as a relatively light-weight module loader.
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.