Using the POSIX Fake Client - StarGate01/AmongUs-Mumble GitHub Wiki

The fake client binds to the Mumble Link plugin on Linux and Mac OSX and sets your ingame position to (almost) zero. This is not optimal, but better than nothing.

Install make and g++, on OSX you can use Homebrew (https://brew.sh). Then open your terminal, change into the POSIX directory. Run make to build the tool, and make run to run it.