I updated HOWTO and patches.
http://sparcs.kaist.ac.kr/~tinuviel/download/IronRuby/
To quote: “Previously, you had to build Mono from SVN. Instruction is
still provided
below in case it is needed again. But you can use Mono 1.9 release just
fine.” Hooray!
patch-mono-r93 adds “noconfig” switch on Mono to resolve System.Action
name collision, as recommended by Mono developers.