Installing wordpress-mu on freebsd is easy as installing another port.
This is the steps required to install wordpress-mu:
Change to /usr/ports/www/wordpress-mu
As root issue “make install clean”
Change to /usr/local/www/wordpress-mu
Issue chown www:www /usr/local/www/wordpress-mu
Create database
As mysql root issue:
create database wordpressmu;
grant all privileges on wordpressmu.* to wordpressmu@localhost identified by ‘wordpress-mu’;
Configure apache to make /usr/local/www/wordpress-mu accessible from web, in this example http://yourserver.tld/blog/
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