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http://www.ficksworkshop.com/blog/14-coding/65-installing-gcc-on-mac
http://www.janosgyerik.com/working-with-different-versions-of-python-on-osx-using-macports/

1. Browse to the MacPorts website.
2. Download the DMG image for your operating system
3. Open up a terminal Applications > Utilities > Terminal

4. Make sure that you have the latest version by running the self-update via the terminal command:

   Code Block
   sudo port -v selfupdate

   
   

5. Install GCC or Python via the terminal command

   Code Block
   sudo port install gcc5 sudo port install gcc6 sudo port install gcc12 sudo port install python27 sudo port install python311

   
   

6. First, identify which versions are installed on your system.

   Code Block
   port select --list gcc port select --list python

   
   

7. To make the version of gcc or python the default (i.e. the version you get when you run python or gfortran), run:

   Code Block
   sudo port select --set gcc gcc12 sudo port select --set python python311