@ synthsize signal in XTSMeterView.m produces ivar error when run in Release mode

When Heterodyne is run in Release mode [not in Debug mode, where all is OK], the following error is generated:

/Heterodyne/XTSMeterView.m:14:13: error: synthesized property 'signal' must either be named the same as a compatible ivar or must explicitly name an ivar @synthesize signal;

         ^

1 error generated.

To fix this I just added to XTSMeterView.h the line "float signal;" so that is looks like this:

@interface XTSMeterView : NSView { @private

float needlePos;

float sweep;

float signal;

}