rosws makes ROS_ROOT disappear in Groovy [closed]

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A very basic problem:

• I installed ROS Groovy, added /opt/ros/groovy/setup.bash to my .bashrc file
• Then I created a ros_workspace dir in ~/ (mkdir, cd, rosws init, source setup.bash).
• I noticed that ROS_ROOT was gone from my environment variables after sourcing my workspace (not before). I don't have this problem in Fuerte. My packages that were in my ros workspace won't compile now, even if I manually do "export ROS_ROOT=/opt/ros/groovy".

Why is that?

PS: I can't use catkin with my previous packages, and I want to use some features that are not in Fuerte.