https://github.com/Perl-Toolchain-Gang/Module-Build/issues/22 The upshot is that lots of modules will no longer be able to use M::B if they want to, through no fault of their own, because M::B uses them. Currently they could use M::B, even though it seems like a circular dependency, because they know it's already present in the core, so the M::B dependency is satisfied if a certain minimum perl version is available. Maybe this is an unavoidable consequence of using Perl tools to build Perl tools, I'm not sure. `configure_requires` doesn't help much here. But an autobundling feature (putting the installer tool, whether M::B or EU::MM or whatever, in an inc/ directory) seems like it could do the trick. -KenThread Next