<varname>DOC_PREFIX
</varname> is the path to the root of the FreeBSD Document Project tree. This is not always that easy to find, and is also easily overridden, to allow for flexibility.
<varname>.CURDIR
</varname> is a
<citerefentry><refentrytitle>make
</refentrytitle><manvolnum>1
</manvolnum></citerefentry> builtin variable with the path to the current directory.