If checked, private and protected methods are included in the class list. By default, private and protect methods are not listed. If Flat View is also selected, all inherited class methods are displayed as well. If checked, all of the Ruby system classes and modules are displayed in the classes list box, along with the Tk classes and the Gem Finder classes. Leaving System unchecked allows an unobstructed view of the user's classes.
Type make install to get a basic installation.
If you want more control of the installation process, try a variation on one of the following commands. This is a common option if you are using stow to control your installations. This version will display all the install actions without actually performing them. This prints a summary of the installation options. Here's some off the top of my head.