|Subject:||DateTime is not properly installed by old versions of CPAN|
Before 1.81, CPAN didn't have direct support for Module::Build. (perl 5.8.8 ships with CPAN 1.76_02, so there are many active Perl installs that do not have CPAN support for Module::Build.) This causes these old CPANs to attempt to create their own Makefile.PL for the package, which doesn't compile the XS properly, and I think doesn't even install prerequisites properly. The normal workaround for this is to add this to the Build.PL config: create_makefile_pl => 'passthrough'