installing to jail

[Mickey Harvey]

Is there an easy way to install a port from a host system to the equivalent
directories in a hosted jail? For example if I have a jail at /jail/www and
want to install a port that installs its config file as
/usr/local/etc/thefile.conf and its binaries into /usr/local/bin. Is there a
way to easily change it to install the files to
/jail/www/usr/local/etc/thefile.conf and /jail/www/usr/local/bin?