R0 stands for radare-zero
cd Ports/r0
./package.sh
r0 aims to be a minimalistic reimplementation of the radare shell without much complexity and relaying all the extensibility to external applications trying to keep the source as small as possible.
Website: https://github.com/radareorg/r0
Port: https://github.com/SerenityOS/serenity/tree/master/Ports/r0