ExtUtils::MY - ExtUtils::MakeMaker subclass for customization
# in your Makefile.PL sub MY::whatever { ... }
FOR INTERNAL USE ONLY
ExtUtils::MY is a subclass of ExtUtils::MM. Its provided in your Makefile.PL for you to add and override MakeMaker functionality.
It also provides a convenient alias via the MY class.
ExtUtils::MY might turn out to be a temporary solution, but MY won't go away.