ref: 59fe51f5cbb81a135734c693ab51a5b243534c92
dir: /README/
forks, patches, bikeshedding. example usage: ; ramfs -u ; unionfs -m /sys -c /tmp /usr/qwx/p/fork/sys /tmp /sys ; cd /tmp ; mkdir -p `{cd /sys; walk -d src include} ; cd /sys/src ; mk nuke ; mk install unionfs: http://shithub.us/kvik/unionfs/HEAD/f.html