Selecting a new gcc version installed via MacPorts

MacPorts is useful for installing a variety of command-line utilities and programs for Mac OS X. There are others, e.g. Homebrew. After using MacPorts to update a GNU gcc installation, it is useful to select the new revision. Tips were posted to this Stack Overflow thread. Basically, it boils down to two steps:

  1. sudo port select --list gcc
  2. sudo port select --set gcc mp-gcc47
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