How to set environment variables in Netbeans 8.0.2

问题:

I'm running a test class that came with my JRI (Java-R interface) package. I'm running it through NetBeans. Unfortunately, NetBeans complains about R_HOME not being set.

Creating Rengine (with arguments)
Rengine created, waiting for R
R_HOME is not set. Please set all required environment variables before running this program.
Cannot load R
Unable to start R

How can I add the R_HOME environment variable in NetBeans?

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What I have tried:

1. I defined R_HOME in .bash_profile and .bashrc. /Library/Frameworks/R.framework/Resources
2. Right-clicking my project name > Properties > Run ... but then I see nowhere to add environment variables. I only see "Arguments" and "VM Options".

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I just a couple solutions (in the past half hour).

1. Add the line export R_HOME=/path/to/r_home/ in netbeans.conf.
2. Invoke NetBeans from the terminal, where R_HOME is already set.

However, still open to a GUI solution.