Code in the base system that is written and maintained by others, and imported into FreeBSD and adapted. Examples include
<citerefentry><refentrytitle>clang
</refentrytitle><manvolnum>1
</manvolnum></citerefentry>, and
<citerefentry><refentrytitle>sendmail
</refentrytitle><manvolnum>8
</manvolnum></citerefentry>. Most bugs in these areas should be reported to the FreeBSD developers; but in some cases they may need to be reported to the original authors instead if the problems are not FreeBSD-specific.