You are strongly advised to install the plotting program gnuplot on your system (http://www.gnuplot.info). That's all you need I think, apart from Perl of course. Perl 5.6.1 or higher is recommended, but 5.6.0 works too (you may experience memory leaks).
PerlGP is currently only tested under Linux, but it should work on all Unix-like systems (it used to run on IRIX a few years ago, and in MacPerl even longer ago).