Hi everybody,
I've got my rpi4 with RetroPie 4.7.2 with the exact same problem. But unlike PiDad, my setup script is pointing to the master repo: https://github.com/RetroPie/RetroPie-Setup.git
Any help would be appreciated,I really need to get avdmame 1.4 installed so I can get my lightgun up and running.
Cheers
Magickz