ports/www/apache13 was changed early this year to allow compilation
either with *no* expat library, or with an external library
(ports/textproc/expat2). The built-in expat-lite cannot be addressed any
longer by the port's configuration. However this would be sufficient for
many purposes, including mod_dav.
I would *not* like to be required to install ports/textproc/expat2
(which also requires ports/devel/libtool13) to avoid unnecessary ports
Over to maintainer.
Another fix comitted