Answer: Very Easy!
svn co http://svn.codehaus.org/jruby/trunk/jruby cd jruby ant
export PATH=$PATH:$PWD/bin jruby my_script.rb
gem install somegem
OR
jruby -S gem install somegem
jruby -J-server -O test/bench/bench_method_dispatch.rb
(-J-server uses the "server" JVM and -O disables ObjectSpace)
ant clean test
Channel #jruby on FreeNode IRC
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