Commited Tue. October 16, 2007 at 12:16:36 PM EDT
Have to unexport variables to avoid having changes made in the current Makefile from being passed to recursive sub-makes.
However, also means that environment settings will only affect the top level make. Not sure if that's a problem...
(Trigger for this patch was lots of warnings generated from Xcode because it set CXXFLAGS, which then caused -Weffc++ to be passed from top level make to newmat/roboop makes)