Thanks to recent commits from Wayne, you can now pass a build flag when install jruby with rvm and it will build jruby instead of downloading a prebuilt copy. Make sure you
rvm get head && rvm reload first. Then we can install jruby with 1.9 mode as the default:
rvm install jruby -C -Djruby.default.ruby.version=1.9
And if you want to use jruby-head:
rvm install jruby-head -C -Djruby.default.ruby.version=1.9
Thanks! That was exactly what I was looking for.
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