i would like to try but i am new with unix so all this build, make, install… stuff is a little confunsing. So i just write down the my steps please tell me if i do sth wrong:

$ sudo su //i am lazy
 $ cd /opt/retropie/emulators/
 $ git clone (https://github.com/ricrpi/mupen64plus) //without brackets
 $ cd ./mupen64plus
 $ ./build.sh
 $ make && install ./ 

when i do build.sh it starts but then throws an error 403 while accesing github.com/ricrpi/mupen64plus/info/refs ????

Did anybody here encounter the same?