title: CImg.h can't run in Xcode environment
body: <p>*****Code*****</p>
  
  <pre><code>#include "CImg.h"
  #include &lt;stdlib.h&gt;
  
  using namespace cimg_library;
  
  int main() {
  
      CImg&lt;unsigned char&gt; image("lena.png");
  
      image.display();
  
      return 0;
  
  }
  </code></pre>
  
  <p>*****ERROR*****
  Build successful but stuck somewhere:
  OUTPUT:</p>
  
  <p>[CImg] <strong>* CImgIOException *</strong> [instance(0,0,0,0,0x0,non-shared)] CImg::load(): Failed to open file 'lena.png'.
  libc++abi.dylib: terminating with uncaught exception of type cimg_library::CImgIOException: [instance(0,0,0,0,0x0,non-shared)] CImg::load(): Failed to open file 'lena.png'.</p>