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sudo installer -pkg MacPorts-2.1.2-10.6-SnowLeopard.pkg -target /

sudo port clean --all all

sudo port -d selfupdate

sudo port upgrade outdated


Reinstall ports

Save the currently installed ports:

port -qv installed > macPorts.txt

Uninstall the currently installed ports:

sudo port -f uninstall installed

Clean any partial builds:

sudo port clean all

Re-install the ports:

curl -O https://svn.macports.org/repository/macports/contrib/restore_ports/restore_ports.tcl
chmod +x restore_ports.tcl
sudo ./restore_ports.tcl macPorts.txt

OSX:MacPorts is mentioned on: OSX