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macosterminalfortrangfortran

Cannot install fortran program on macOS via Terminal

When I run make in the Terminal I get the following error:

    gfortran: warning: couldn’t understand kern.osversion ‘15.6.0 
    gfortran  -O1  -I..    -DFLUSH  -c ../aocn2.f90

Any ideas on how to install fortran for macOS?

Solution

  • IMHO, the easiest way to install Fortran under macOS/OSX is via homebrew.

    First, go to App Store and install Apple's Xcode. You can get to App Store by typing ⌘space and starting to type App Store and then hit Enter/Return once it guesses correctly. Xcode looks like this:

    enter image description here

    Then start a Terminal, using ⌘space Terminal Enter/Return and do the rest in Terminal.

    Install the "Xcode command line tools":

    xcode-select --install

    Then install homebrew by going to homebrew website and copying and pasting the one-liner there.

    Then install GCC ("GNU Compiler Collection") which includes gfortran:

    brew install gcc

    You will need to set your PATH to include /usr/local/bin which is where homebrew installs programs:

    export PATH=/usr/local/bin:$PATH

    You can now run:

    gfortran someFile.for