From https://github.com/funtoo/metro/issues/18

Hi,
i received an error of misconfiguration when compiling stage1, but gives me "die command not found". Looking at ${tmpmetro}/tmp/steps/chroot/run.metro i see a lot of "[...] || die [...]" lines, but no die functions.

i suppose something like:

function die()
{
echo ${@}
exit 2
}

is desiderable.
I haven't found any source or include in the file, but maybe i'm missing something.

Regards,
Matteo