Is Xcode 26 compatible with 2025r2.1?

That was! Thanks!

I had tools installed by brew but were not “activated” (selected, the pulldown had no selection) in preference’s settings.

➜ ~ xcode-select --install
xcode-select: note: Command line tools are already installed. Use “Software Update” in System Settings or the softwareupdate command line interface to install updates

Capture attached, perhaps helps someone in future.