For Windows Users

This a bit theoretical (untested, please correct me if I am wrong)

You should have regular (vanilla) processing installed.

At a minimum you will need to java installed ( preferably jdk1.7.0_45 ), you cannot rely on the version included with processing. You will also need a version of ruby installed, preferably jruby-1.7.10, which you can get here windows installer. You can get by with a regular ruby installation (at least version 1.9.3), but you would need to use the --nojruby option on all sketches.

###Configuration### In addition to setting the processing root (if you follow PhiLhos lead this could be c:/Java/Processing-2.1.0, note no stupid folder names with spaces or other daft/illegal characters) it may also be necessary to set the path to ruby-processing root RP5_HOME in the .rp5rc file ( because of lack of relative path support? ). The post installer uses wget to download jruby-complete, however if you haven't got wget, you can manually download jruby-complete and put in the the vendors folder and re-run install_jruby_complete