A request for help


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conflict between MacPorts and homebrew
Marco
Your problem is that you have gfortran installed both under MacPorts (/usr/local/bin/gfortran) and homebrew (usr/local/Cellar/gcc/7.2.0/bin/gfortran).
I do NOT recommend using MacPorts.
Please send the output of following commands

ls -lrt /usr/local/bin/gfortran
brew reinstall gcc
brew doctor