Apache::SSI implements the functionality of mod_include for handling server-parsed html documents. It runs under Apache's mod_perl. In my mind, there are two main reasons you might want to use this module: you can sub-class it to implement your own custom SSI directives, and/or you can parse the output of other mod_perl handlers, or send the SSI output through another handler (use Apache::Filter to do this).
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.