As you all may have experienced, there is a problem with macOS Catalina and Homebrew. When trying to install packages using the brew install %packagename% you receive the following error (or something similar):
Warning: You are using macOS 10.15. We do not provide support for this pre-release version. You will encounter build failures with some formulae. Please create pull requests instead of asking for help on Homebrew's GitHub, Discourse, Twitter or IRC. You are responsible for resolving any issues you experience, as you are running this pre-release version.
To fix this problem, you will need to install the x-code update
xcode-select --install
It will launch a GUI pop-up that will ask you to install the x-code. Once that is complete, you will need to update the homebrew installation by running:
brew upgrade
Let it complete. No reboot is necessary. This should now work well. I tested the update by installing arping.
As you can see, no errors and install completed.
Hope this helps
