I had just installed Ruby 1.9.1 using MacPorts, but TextMate still
interprets Ruby 1.8.6.

I had gone into my Shell Variables under preferences and set the
following:

Variable: TM_RUBY
Path: ./opt/local/bin/ruby1.9 (install location of my Ruby 1.9.1
install).

I ran a program, it ran on Ruby 1.9.1. I un-checked the Shell Variable
preference; it ran on Ruby 1.8.6. I checked the setting and re-ran, got
a "Command Error at line 6" pointing to some file in /tmp.

Is this configured properly? If so, what's wrong?

If it's not, what's the proper configuration?
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