Build Reicast emulator on Ubuntu/Debian

build-reicast-deb.sh

# Install prerequisites
sudo apt-get -y install build-essential libasound2 libasound2-dev libegl1-mesa-dev libgl1-mesa-dev libgles2-mesa-dev mesa-common-dev libudev-dev
# Build Reicast
git clone https://github.com/reicast/reicast-emulator.git
cd reicast-emulator
git checkout master # Make sure on 'master' branch so will find the necessary subdir (not in alpha branch).
cd shell/linux
make

# Run Reicast
mkdir -p ~/.local/share/reicast/data/
cp ../android/assets/buttons.png ~/.local/share/reicast/data/
cp /path/to/bios/dc_boot.bin ~/.local/share/reicast/data/
cp /path/to/bios/dc_flash.bin ~/.local/share/reicast/data/
./reicast.elf

# To open a ROM
./reicast.elf /path/to/rom.cdi

# Key bindings
# Arrow keys: arrow keys
# A: v
# Start: Enter

As provided by https://gist.github.com/bmaupin/a00a2dcd9e075999e6a9 but just tweaked to install another dependency (https://packages.ubuntu.com/focal/libudev-dev) and checkout the master branch first.