I made some changes at the end of builder.rb to the section for building the RI database. But I''m not sure that I did the correct thing, so I wanted get your feedback (especially Andy). Originally I was getting this: Building RI database ..\..\bin\rdoc --ri-system ./commands.rb:200:in `run'': Command failed: (RuntimeError) from ./commands.rb:168:in `each'' from ./commands.rb:168:in `run'' from builder.rb:446 NMAKE : fatal error U1077: ''ruby.exe'' : return code ''0x1'' Stop. So I changed the command to: ..\..\bin\rdoc.bat --ri-system This was better, as I now got this: Building RI database E:/Dev/RubyDev/rubyinstaller/cvs-repo/installer/stable/download/ruby-1.8.1 ..\..\bin\rdoc.bat --ri-system unrecognized option `--ri-system'' For help on options, try ''rdoc --help'' I ran the --help option, and did not see "-ri-system" anywhere in there. So I change the option to "-ri-site" which seemed like the mostly likely replacement for the invalid option. Now it runs just fine, but was this the right thing to do? Curt