xv6

sudo apt-get install build-essentials sudo apt-get install dh-autoreconf libsdl1.2-dev libgcc-4.9-dev:i386

git clone https://github.com/geofft/qemu.git -b 6.828-1.7.0 cd qemu ./configure --disable-kvm --target-list="i386-softmmu x86_64-softmmu" make sudo make install

https://pdos.csail.mit.edu/6.828/2014/tools.html