Not working properly while using S7GraphView

I want to draw a line graph in iphone and am using S7GraphView for it.But when I compile my app it is showing so many errors like:

"CGContextSetFillColorWithColor", referenced from:
      -[S7GraphView drawRect:] in S7GraphView.o
  "_CGContextFillRect", referenced from:
      -[S7GraphView drawRect:] in S7GraphView.o
开发者_开发百科  "_CGContextSetLineDash", referenced from:
      -[S7GraphView drawRect:] in S7GraphView.o
  "_CGContextSetLineWidth", referenced from:
      -[S7GraphView drawRect:] in S7GraphView.o
  "_CGContextMoveToPoint", referenced from:
      -[S7GraphView drawRect:] in S7GraphView.o
  "_CGContextAddLineToPoint", referenced from:
      -[S7GraphView drawRect:] in S7GraphView.o
  "_CGContextClosePath", referenced from:
      -[S7GraphView drawRect:] in S7GraphView.o
  "_CGContextSetStrokeColorWithColor", referenced from:
      -[S7GraphView drawRect:] in S7GraphView.o
  "_CGContextStrokePath", referenced from:
      -[S7GraphView drawRect:] in S7GraphView.o
  "_CGContextFillPath", referenced from:
      -[S7GraphView drawRect:] in S7GraphView.o

Can anybody help me?

Try linking you application to Quartz.framework and/or QuartzCore.framework.