Mountain Lion a cassé MacPorts - Mise à jour impossible

J'essaie de mettre à jour MacPorts mais j'obtiens l'erreur suivante.

sudo port selfupdate
Password:
--->  Updating MacPorts base sources using rsync
MacPorts base version 2.1.1 installed,
MacPorts base version 2.1.2 downloaded.
--->  Updating the ports tree
--->  MacPorts base is outdated, installing new version 2.1.2
Installing new MacPorts release in /opt/local as root:admin; permissions 0755; Tcl-Package in /Library/Tcl

Error: /opt/local/bin/port: port selfupdate failed: Error installing new MacPorts base: command execution failed

Lorsque je suis https://trac.macports.org/wiki/Migration

A l'étape 3, j'obtiens l'erreur suivante. Est-ce important ou puis-je continuer ?

Error: Unable to open port: can't read "build.pre_args": can't read "build.cmd": Failed to locate 'gnumake' in path: '/opt/local/bin:/opt/local/sbin:/bin:/sbin:/usr/bin:/usr/sbin' or at its MacPorts configuration time location, did you move it?