How to build and run on Ubuntu 22.04, for those of us coming in late:
git clone git@github.com:brijohn/mame.git mame-nabu
cd mame-nabu
git checkout nabupc_wip
make -j6
mkdir -p roms/nabupc
cd roms/nabupc
wget 'https://www.nabunetwork.com/download-manager.php?id=2' -O...