Why is Errno.pm on CPAN

Is there any good reason to have Errno.pm at CPAN as an ordinary
module and not just part of core?

Both the cpan version and the core version tests that the Config.pm
the module was build with and used with is compatible. But this means
that the following steps breaks you perl installation at least on
linux:

1. install perl

2. install Errno.pm from CPAN

3. upgrade linux kernel

4. reinstall perl


The version check it self is sane and probably the best portable
check, but at least on linux it is a bit to strong.

But why would you install Errno from CPAN?


//Makholm