Sets commands for MakeMaker to use in Makefiles. ExtUtils::Command::MM encapsulates code that would otherwise have to be done with large one-liners. This module is shipped with the Perl 5.8 source kit.
Everything is read from @ARGV, unless otherwise noted. For example:
test_harness($verbose, @test_libs);
runs the tests on @ARGV via Test::Harness passing through the $verbose flag. Any @test_libs will be unshifted onto the test's @INC.