chruby can be used with pow to select a specific Ruby per project, or system-wide.
To set a default Ruby for all pow apps, put the following in ~/.powconfig.
source /etc/profile.d/chruby.sh
or, if you installed chruby with homebrew:
source /usr/local/share/chruby/chruby.sh
To set a Ruby for a single application put the following in .powrc or .powenv in your applications root directory. See Choosing the Right Environment Script in the pow manual for details on which file to use.
source /etc/profile.d/chruby.sh
chruby $(cat .ruby-version)
Adjust the paths to match your install. This assumes that you have installed a ruby that matches *1.9*.
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