Can't use Quartz on phone, compile works but build fails..what am I missing

Just simple lines like...
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetRGBStrokeColor(context, 1.0, 1.0, 1.0, 1.0);
CGContextSetLineWidth(context, 2.0);
fail when I try to run it.
Linking....
"_CGContextSetLineWidth", referenced from:

Exactly.
Just in case you're not sure how to do this.
Expand "Targets" in Xcode and double click your app name.
Click the '+' button at the bottom under Linked Libraries and add "QuartzCore.framework"

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Can't use Quartz on phone, compile works but build fails..what am I missing

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