Seguí recibiendo el siguiente error de enlazador cuando intento usar Core Plot en mi proyecto ...

Undefined symbols for architecture i386:
  "_OBJC_CLASS_$_CPXYGraph", referenced from:
      objc-class-ref in CorePlotImplViewController.o
  "_OBJC_CLASS_$_CPPlotRange", referenced from:
      objc-class-ref in CorePlotImplViewController.o
  "_OBJC_CLASS_$_CPLineStyle", referenced from:
      objc-class-ref in CorePlotImplViewController.o
  "_OBJC_CLASS_$_CPColor", referenced from:
      objc-class-ref in CorePlotImplViewController.o
  "_OBJC_CLASS_$_CPScatterPlot", referenced from:
      objc-class-ref in CorePlotImplViewController.o
  "_OBJC_CLASS_$_CPPlotSymbol", referenced from:
      objc-class-ref in CorePlotImplViewController.o
  "_OBJC_CLASS_$_CPFill", referenced from:
      objc-class-ref in CorePlotImplViewController.o
  ".objc_class_name_NSNumber", referenced from:
      pointer-to-literal-objc-class-name in libCorePlot.a(CPPlot.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPScatterPlot.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPBarPlot.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPUtilities.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPTradingRangePlot.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPPieChart.o)
  ".objc_class_name_NSMutableDictionary", referenced from:
      pointer-to-literal-objc-class-name in libCorePlot.a(CPPlot.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPTheme.o)
  ".objc_class_name_NSDecimalNumber", referenced from:
      pointer-to-literal-objc-class-name in libCorePlot.a(CPPlot.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPScatterPlot.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPBarPlot.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(NSNumberExtensions.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPUtilities.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPPlotRange.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPAxis.o)
      ...
  ".objc_class_name_NSMutableArray", referenced from:
      pointer-to-literal-objc-class-name in libCorePlot.a(CPPlot.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPScatterPlot.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPBarPlot.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPGraph.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPTradingRangePlot.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPPieChart.o)
  ".objc_class_name_NSArray", referenced from:
      pointer-to-literal-objc-class-name in libCorePlot.a(CPPlot.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPScatterPlot.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPBarPlot.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPGraph.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPAxisSet.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPTheme.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPTradingRangePlot.o)
      ...
  ".objc_class_name_NSException", referenced from:
      pointer-to-literal-objc-class-name in libCorePlot.a(CPScatterPlot.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPBarPlot.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPGraph.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPGradient.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPLayer.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPXYPlotSpace.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPTheme.o)
      ...
  ".objc_class_name_NSNull", referenced from:
      pointer-to-literal-objc-class-name in libCorePlot.a(CPScatterPlot.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPBarPlot.o)
  ".objc_class_name_NSValueTransformer", referenced from:
      pointer-to-literal-objc-class-name in libCorePlot.a(CPScatterPlot.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPTradingRangePlot.o)
  ".objc_class_name_NSObject", referenced from:
      .objc_class_name_CPPlotSymbol in libCorePlot.a(CPPlotSymbol.o)
      .objc_class_name_CPPlotSpace in libCorePlot.a(CPPlotSpace.o)
      .objc_class_name_CPPlotRange in libCorePlot.a(CPPlotRange.o)
      .objc_class_name_CPFill in libCorePlot.a(CPFill.o)
      .objc_class_name_CPGradient in libCorePlot.a(CPGradient.o)
      .objc_class_name_CPImage in libCorePlot.a(CPImage.o)
      .objc_class_name_CPLineStyle in libCorePlot.a(CPLineStyle.o)
      ...
  ".objc_class_name_NSNotificationCenter", referenced from:
      pointer-to-literal-objc-class-name in libCorePlot.a(CPGraph.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPXYPlotSpace.o)
  ".objc_class_name_NSString", referenced from:
      pointer-to-literal-objc-class-name in libCorePlot.a(CPUtilities.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPPlotRange.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPLayer.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPAxis.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPTextLayer.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPAxisLabel.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPAxisTitle.o)
      ...
  ".objc_class_name_NSScanner", referenced from:
      pointer-to-literal-objc-class-name in libCorePlot.a(CPUtilities.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPAxis.o)
  ".objc_class_name_NSLocale", referenced from:
      pointer-to-literal-objc-class-name in libCorePlot.a(CPPlotRange.o)
  ".objc_class_name_UIColor", referenced from:
      pointer-to-literal-objc-class-name in libCorePlot.a(CPPlatformSpecificCategories.o)
      pointer-to-literal-objc-class-name in libCorePlot.a(CPLayerHostingView.o)
  ".objc_class_name_NSMutableData", referenced from:
      pointer-to-literal-objc-class-name in libCorePlot.a(CPLayer.o)
  ".objc_class_name_CALayer", referenced from:
      .objc_class_name_CPLayer in libCorePlot.a(CPLayer.o)
  ".objc_class_name_NSMutableSet", referenced from:
      pointer-to-literal-objc-class-name in libCorePlot.a(CPAxis.o)
  ".objc_class_name_NSNumberFormatter", referenced from:
      pointer-to-literal-objc-class-name in libCorePlot.a(CPAxis.o)
      .objc_class_name_CPTimeFormatter in libCorePlot.a(CPTimeFormatter.o)
  ".objc_class_name_NSSet", referenced from:
      pointer-to-literal-objc-class-name in libCorePlot.a(CPAxis.o)
  ".objc_class_name_UIView", referenced from:
      .objc_class_name_CPLayerHostingView in libCorePlot.a(CPLayerHostingView.o)
  ".objc_class_name_NSDateFormatter", referenced from:
      pointer-to-literal-objc-class-name in libCorePlot.a(CPTimeFormatter.o)
  ".objc_class_name_NSDate", referenced from:
      pointer-to-literal-objc-class-name in libCorePlot.a(CPTimeFormatter.o)
  ".objc_class_name_UIFont", referenced from:
      pointer-to-literal-objc-class-name in libCorePlot.a(CPTextStylePlatformSpecific.o)
ld: symbol(s) not found for architecture i386
collect2: ld returned 1 exit status

cualquier idea, ¿cómo puedo solucionar esto? He estado intentando más de 2 horas ya ...

He descargado otros ejemplos, pero sigo recibiendo el mismo error de vinculador.

Agradecemos cualquier ayuda ...