title: Unresolved external symbol error in openCV
body: <p>I am a beginner in openCV. I have been trying out face detection and recognition in Windows platform. I have integrated different pieces of codes. I am also using PCA method to recognize the faces.I am getting an error like below,</p>
  
  <blockquote>
    <p>Error 1   error LNK1120: 2 unresolved externals Error 2   error LNK2019:
    unresolved external symbol _cvCalcEigenObjects referenced in function
    "void __cdecl doPCA(void)" (?doPCA@@YAXXZ)     Error  3   error LNK2019:
    unresolved external symbol _cvEigenDecomposite referenced in function
    "void __cdecl learn(char *)" (?learn@@YAXPAD@Z)</p>
  </blockquote>
  
  <p>can someone please resolve.,..</p>