Just a quick note that I tested running Pd from the command line using a newer version of Tcl/Tk installed via the Homebrew package manager. Works fine, Tk Wish 8.6.11 on macOS 11.2.

You mainly need to make sure the right wish app is invoked and *not* the old buggy version which comes with the system.

For testing, I used:

    /opt/homebrew/opt/tcl-tk/bin/wish8.6 ~/src/pure-data/tcl/pd-gui.tcl

If you add /opt/homebrew/opt/tcl-tk/bin to the start of your PATH, then Pd would use the alternate install automatically.

Anyway, one more step towards being able to build & install Pd to the system via Homebrew.