From @coke

When installing rakudo somewhere else on your system, we can't force a
rebuild of nqp or the vms without first removing the existing
installed copies (which means we have a period where we'd break the
usage of rakudo for any users on the box.)

The easiest solution I can think of is to add a --force option to
Configure.pl which would force nqp/vm's to be re-built and reinstalled
into the prefix directory, regardless of whether the installed
versions at that prefix were recent enough.

This would also avoid the issue of re-building a VM with different
config options. e.g. rebuilding rakudo-on-moar to use the JIT -
currently if you have a new enough version of moar installed, you
couldn't install a new one with a different JIT option without
removing the installed version first.

--
Will "Coke" Coleda

@coke - Status changed from 'new' to 'open'