It’s much easier to do certain development tasks in WSL. Windows Subsystem for Linux gives near-native Linux functionality in a Windows window. The gfortran package for MacOS X installs all files in the /usr/local/gfortran directory, and a single symbolic link ( /usr/local/bin/gfortran). You may need to add user permission to create symbolic links. (a) how to install DISLIN on the RPi, (b) how to make GFortran work how to make DISLIN link DISLIN code, (c) how to do that also with Simply Fortran. Once it is open, the additional components have been installed and you can close it. (you’ll administrator password to complete it). Now that is’s finished, you need to start XCode to allow it to install additional components. Find the latest version supported on your platform: XCode 3.1.4 for Leopard, XCode 4 for Snow Leopard, XCode 4.6.3 for Lion, Xcode 5.0.1 for Mountain Lion and Mavericks. After it finished downloading begin installation. Click on Downloads > Developer Tools in the sidebar. Install the desired GCC and G++ versions by typing: sudo apt install gcc-8 g++-8 gcc-9 g++-9 gcc-10 g++-10. These can be downloaded from (free registration required). In the following example, we will install the latest three versions of GCC and G++. To install any of them, you need to have the Apple Developer Tools installed, as well as 'command line developer tools'.

Apple-style installers of gfortran for Mac OS X are made available for download here.

Install gfortran-6 link