I decided to check out Ruby 1.9.1, since it's supposed to be actually usable in the speed department on Windows. So I downloaded the binary for 1.9.1-p129 from the official Ruby server and, after about half a day of wrangling, got it working. However, when I try to point Rubymine 1.5 EAP at the ruby.exe file, it gives me the message "Rubygems not installed for SDK" followed by the executable's path. I know rubygems is installed because I used it to install Rails, the sqlite3 gem, etc. I tried with both the version of rubygems bundled with Rujby 1.9.1 (1.3) and updating it to the latest version (1.5.) Neither works.
When I point Rubymine to my old InstantRails supplied Ruby 1.8.6 binary, I don't get this same message.
Did I forget to do something? The ruby bin directory is in my path, so I can just open up cmd.exe and type 'gem -v' and get a response. I tried putting ruby in both "C:\Program Files(x86)\ruby" and "C:\ruby". What am I doing wrong? Or is it a Rubymine bug?