This means we can't use this cookbook on existing base64-1.7.x machines.  I'm mostly okay with that, but I was doing some extra-fun joyent image detection over in an application-specific cookbook to make this work.  Adding a symlink a là `test -d /var/pgsql/data || ln -sv /var/pgsql/data91 /var/pgsql/data` also works for me.