I was about to create a pull request that made things work under Git Bash (MSysGit) that allowed you to specify JRUBY_HOME outside the script so you wouldn't have to worry about c:\whatever vs. /c/whatever rewriting issues. This looks like it might resolve the situation in a more general way. Do you think so?

I can't be sure, but I don't think that will solve the issue. MinGW is already looking in the correct location, it's just using the wrong executable. The problem is that MinGW sees the jruby shell script and tries to execute that first, which doesn't work from MinGW. On Windows, jruby.exe is what ought to be executed. The simplest solution is to simply delete the jruby shell script. My change accomplishes virtually the same thing, by quickly executing jruby.exe from the jruby shell script.

This seems OK to pull, but for some reason Github won't let me. ("This pull request can not be automatically merged.")

Can you open a ticket at http://bugs.jruby.org and attach a git patch there?

I created a new branch (mingw) and rebased from master in order to make a clean merge. New pull request from mingw branch here: #42

This pull request was duplicated by pull #42 which was successfully merged into master and closed.