In a Terminal window run the following commands:

curl -O http://svn.macports.org/repository/macports/downloads/MacPorts-1.6.0/MacPorts-1.6.0.tar.bz2 

bunzip2 MacPorts-1.6.0.tar.bz2 

tar xvf MacPorts-1.6.0.tar

cd MacPorts-1.6.0

./configure

make

sudo make install

export PATH=/opt/local/bin:/opt/local/sbin:$PATH

sudo port -d selfupdate

Edit /etc/profile and add "/opt/local/sbin:/opt/local/bin" to PATH:

PATH="/bin:/sbin:/usr/bin:/usr/sbin:/opt/local/sbin:/opt/local/bin"

NOTE: OS X Server already has ClamAV installed and you might want ot set /opt/local/bin and /opt/local/bin first in PATH. This would allow having Apple's ClamAV and MacPorts' ClamAV installation. PATH="/opt/local/bin:/opt/local/sbin:/bin:/sbin:/usr/bin:/usr/sbin"

Edit /etc/csh.login and add "/opt/local/sbin:/opt/local/bin" to PATH:

setenv PATH "/bin:/sbin:/usr/bin:/usr/sbin:/opt/local/sbin:/opt/local/bin

NOTE: OS X Server already has ClamAV installed and you might want ot set /opt/local/bin and /opt/local/bin first in PATH. This would allow having Apple's ClamAV and MacPorts' ClamAV installation. setenv PATH "/opt/local/bin:/opt/local/sbin:/bin:/sbin:/usr/bin:/usr/sbin"