3) Portability under non-UNIX systems:
Under other operating systems some other arrangement needs to be made
to run the file. For example under MS-Windows, the supplied batch file
latexmk.bat will do this. Under current TeXLive (2009 or later)
distribution, latexmk can be installed by TeXLive's package
manager, in which case an executable program is also installed to
run latexmk.pl, and an appropriate version of Perl is part of the
TeXLive system.