I tried installing Module::Build 0.2806 on a fresh 5.6.2 this evening and found that I needed to manually install Scalar::Util first. They both install cleanly from the CPAN shell.
Is there a reason that the dependency is left undeclared? I also heard that M::B on 5.8.0 requires a newer version of PathTools than is available on 5.8.0 and that the latest PathTools requires M::B. I don't have that version to test with. The guy giving the Perl 6 talk at SPUG reported the 5.8.0 problem. Josh