Install fails with python3.9: RPI.GPIO only works with special flag

[s00500]

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How I did start SLC, with what arguments
python main.py

Led device name
ReSpeaker2

The bug
Hi, I was installing this on the newest RaspberryPi OS, that ships with python 3.9, and the install step failed, as the native compile for RPI.GPIO package failed

Following this stack overflow issue I added CFLAGS=-fcommon to the pip install inside the VENV, that solved the problem just fine

https://askubuntu.com/questions/1290037/error-while-installing-rpi-gpio-as-error-command-errored-out-with-exit-status

Just wanted to report this here :-)

Debug output
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To Reproduce
Just install the version from the 3.0.0 Branch

[Psychokiller1888]

Nice, thank you very much!