I update the newest macOS Big Sur version. But the intel fortran does not work.
The version is "ifort version 18.104.22.1681".
I would be astonished if it DID work. New MacOS releases tend to break non-Apple software more often than not; it's even worse than Linux for this. Did you re-add the XCode command line tools?
Historically, Intel has had to make adjustments in the installation to accommodate new MacOS releases. I'm sure that Ron, a "Mac guy", will chime in with his own observations.
I solved it in my machine (might not be applicable to yours). I had a problem with Xcode.
Once you have installed Xcode, run:
sudo xcode-select -s /Applications/Xcode.app/Contents/Developer
Then accept the license (only if you previously haven't) by:
sudo xcodebuild -license
Then try running the ifort code again, this worked out for me...
Hope it helps you!