Struggling to get CmdStan working on Mac OS Big Sur

[mitzimorris]

Upgrade to MacOS Big Sur - CmdStan and CmdStanPy notes

I upgraded from High Sierra to Big Sur, this meant that I hit some XCode changes. These were solved via the following two commands: xcode-select --install sudo xcode-select -switch /Library/Developer/CommandLineTools (perhaps the xcode-select -switch isn’t necessary when upgrading from Catalina) Then I went to my existing install of the GitHub CmdStan repo, which had existing CmdStan binaries and header files and tried to compile a model. This failed because the PCH header file was out of d…

you should be able to do the same thing using CmdStanPy, FWIW