I'm getting the error you see below:
xcode-select: error: command line tools are already installed, use "Software Update" to install updates
Name@Name-MBP SignUpFlowFanclub % Software Update
zsh: command not found: Software
Name@Name-MBP SignUpFlowFanclub %
you need to update Xcode.
You try softwareupdate --install -a,
if you have problem, use this:
xcode-select --install.
I had a similar issue:
scntool: warning: Could not find bundle inside /Library/Developer/CommandLineTools at path /Library/Developer/SharedFrameworks/ModelIO.framework
Maybe Hebrew or something caused the issue - not sure
sudo xcode-select --reset
did help
I recently updated to MacOS Big Sur version 11.2.3 and found that I had to manually install the Xcode SDK tools from the apple developer site: https://download.developer.apple.com/Developer_Tools/Command_Line_Tools_for_Xcode_12.4/Command_Line_Tools_for_Xcode_12.4.dmg in order to successfully install packages using MacPorts. But even after installing the Xcode_12.4 I still got the same warning messages: Warning: The macOS 11.2 SDK does not appear to be installed. Ports may not build correctly. Warning: You can install it as part of the Xcode Command Line Tools package by running `xcode-select --install'.
I am in the same boat as Greg W. You need an apple account to access the developer tools. I dont know what macports is but homebrew is having trouble updating because it cant find the xcode sdk. Pyenv specifically.
Just wanted to leave this here in case someone has the same problems as I did. There seems to be a bit of an issue after a recent MacOS update. I found this thread which helped me get past the issue of not being able to install the command line tools while repeatedly asking me to install them: https://apple.stackexchange.com/questions/415563/repeatedly-being-asked-to-install-command-line-tools
Essentially, run:
sudo xcode-select -switch /Library/Developer/CommandLineTools