My colleague Kenny Johnston wrote a nice piece about Upgrading to Mountain Lion with an emphasis on using Homebrew. Here are the relevant steps using MacPorts:
XCode:
- Update to the latest XCode 4.4 from the App Store
- Install the Command Line Tools
Of course, since it is zero-day, there was an issue fetching the Command Line Tools from the server and I had to install manually from a .pkg file retrieved from the Apple Developer Portal. If you install the CLI tools package manually, you may need to run the following:
sudo xcodebuild -license
That is required to accept the license terms system-wide.
MacPorts
First, you’ll need to update the base MacPorts installation:
sudo port -v selfupdate
If you run in to a compilation error, you may need to edit the file /opt/local/etc/macports/macports.conf and set the developer_dir option to be empty:
sudo vim /opt/local/etc/macports/macports.conf
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You should now be able to update any outdated ports (grab a beverage while you wait):
sudo port -vu upgrade outdated
GCC 4.2
Now install the apple-gcc42 port to replace the missing GCC 4.2 in Mountain Lion:
sudo port install -vu apple-gcc42
Once that has been installed, you will need to link it to the expected system location:
sudo ln -s /opt/local/bin/gcc-apple-4.2 /usr/bin/gcc-4.2
RVM
Make sure you have the latest RVM version installed:
curl -L https://get.rvm.io | bash -s stable
You should now ensure that you can rebuild your installed Ruby versions:
rvm reinstall 1.9.3
rvm reinstall rbx
...
You may need to reference my earlier tip: Fix Ruby 1.9.x OpenSSL Segfault on OS X