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If you install macports you can install gcc select, and then choose your gcc version.
/opt/local/bin/port install gcc_select To see your versions use
port select --list gcc To select a version use
sudo port select --set gcc gcc40
BibSonomy is offered by the KDE group of the University of Kassel, the DMIR group of the University of Würzburg, and the L3S Research Center, Germany.