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Openstudio measure needs to access system variables

I am writing a measure that requires executing an external program. The external program location is determined by a windows environment variable. I am trying to access it using ruby ENV hash. This works fine when running the measure in a unittest but it doesn't work when running the measure inside the openstudio app.

Any ideas?

Openstudio measure needs to access system variables

I am writing a measure that requires executing an external program. The external program location is determined by a windows environment variable. I am trying to access it using ruby ENV hash. This works fine when running the measure in a unittest but it doesn't work when running the measure inside the openstudio app.

Any ideas?