Of all commands I did not expect to run today, `I_KNOW_WHAT_I_AM_DOING=1 emerge -uDNav --with-bdeps y --backtrack 100 @world` is pretty high up the list.
On Gentoo, that's what you run when you want to use a machine as a space heater or have to upgrade perl, because portage is written in it & you have to reinstall all modules.
I_KNOW_WHAT_I_AM_DOING because I don't wanna recompile everything on a SSD, Chromium/Firefox ebuilds check for free space and ramfs always says it has 0 bytes available.