PSA: Stuff like rvm exists so that you can get your Macbook's software versions in sync with whatever BSD or Linux distribution you're using in production.
Pow in production is also a case of doing it wrong; it's a web server designed to allow you to run multiple Rack applications that talk to each other in one OS without dicking around with IP addresses or port numbers.
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[ 9.3 ms ] story [ 69.9 ms ] threadRVM in production is a case of doing it wrong.
"Pow: Automatic RVM support is deprecated"
http://en.wikipedia.org/wiki/Deprecation