Get Yrij patch and apply it : Credits : Yrij-Zhavoronkov
Optionnaly, you can download the main.cpp file directly and put it in the right folder.
export USE_PULSEAUDIO=1 cd reicast-emulator-last/shell/lin86/ && make
Get config file and put it in ~/.reicast
Don't forget to install DC bios in ~/.reicast/data