File::Spec - portably perform operations on file names

This module is designed to support operations commonly performed on file
specifications (usually called "file names", but not to be confused with
the contents of a file, or Perl's file handles), such as concatenating
several directory and file names into a single path, or determining whether
a path is rooted. It is based on code directly taken from MakeMaker 5.17,
code written by Andreas König, Andy Dougherty, Charles Bailey,
Ilya Zakharevich, Paul Schinder, and others.