The narf executable will print syntax errors to the screen.  A pre-compiled version is located in:

  narf/sapi/win/narf.exe

This file is linked against msvcrt-ruby18.lib, provided with the Windows One-Click Installer:

  http://rubyinstaller.rubyforge.org/wiki/wiki.pl

After installing ruby, place narf.exe ruby/bin, alongside ruby.exe.  In IIS, map .narf and .rb to bin/narf.exe to use the narf runner.
