title: duplicate symbol for architecture x86_64
body: <p>I am facing duplicate symbols issue during use of Core plot API and ESRI map Arc GIS API.
  In my app I am using Core plot and ArcGIS API. To provide support for 64 bit device, I have download new API for ArcGI (ESRI map) and accordingly update CorePlot API for 64 bit. After making changes I am facing issue:</p>
  
  <p>error description are here:</p>
  
  <pre><code>duplicate symbol _squareOfDistanceBetweenPoints in:
      /Users/xxxx/Library/SDKs/ArcGIS/iOS/ArcGIS.framework/ArcGIS(AGSCPTUtilities.o)
      /Users/xxxx/Desktop/18 Nov/SCM_iPad/SCM/CorePlot/coreplot_new.a(CPTUtilities.o)
  duplicate symbol _niceNum in:
      /Users/xxxx/Library/SDKs/ArcGIS/iOS/ArcGIS.framework/ArcGIS(AGSCPTAxis.o)
      /Users/xxxx/Desktop/18 Nov/SCM_iPad/SCM/CorePlot/coreplot_new.a(CPTAxis.o)
  duplicate symbol _CreateRoundedRectPath in:
      /Users/xxxx/Library/SDKs/ArcGIS/iOS/ArcGIS.framework/ArcGIS(AGSCPTPathExtensions.o)
      /Users/xxxx/Desktop/18 Nov/SCM_iPad/SCM/CorePlot/coreplot_new.a(CPTPathExtensions.o)
  duplicate symbol _AddRoundedRectPath in:
      /Users/xxxx/Library/SDKs/ArcGIS/iOS/ArcGIS.framework/ArcGIS(AGSCPTPathExtensions.o)
      /Users/xxxx/Desktop/18 Nov/SCM_iPad/SCM/CorePlot/coreplot_new.a(CPTPathExtensions.o)
  duplicate symbol _MyCGPathApplierFunc in:
      /Users/xxxx/Library/SDKs/ArcGIS/iOS/ArcGIS.framework/ArcGIS(NSCoderExtensions.o)
      /Users/xxxx/Desktop/18 Nov/SCM_iPad/SCM/CorePlot/coreplot_new.a(NSCoderExtensions.o)
  ld: 5 duplicate symbols for architecture x86_64
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>
  
  <p>If anyone face issue please suggest. I am unable to figure out what is duplicate in those API Earlier these two working fine (OLD api without 64 bit support)</p>