I just went through an unpleasant two hours trying to get buildr to install on Windows. May I make two suggestions to improve your "Installing on Windows" section at http://buildr.apache.org/installing.html ?
1. Installing the Ruby one-click installer is not enough, you also need the devkit so you have a compiler and make. The devkit is a 7zip file available on the same page as the one-click installer. You just extract it to your Ruby directory and make sure the paths in devkit/msys/1.0.11/etc/fstab are accurate. 2. The version rjb-1.1.9 required by buildr-1.3.5 does not build when your JAVA_HOME has spaces in the path. The default install location is in "C:/Program Files", which means rjb will not build. rjb-1.2.0 works, so please either release an updated buildr gem that works with this fixed version of rjb or suggest a work-around of installing the JDK to a non-default location with no spaces in the path. Thanks, -- Will