title: openssl/bn.h: No such file or directory
body: <p>I am totally new to Obj-C, and trying to compile Big Number related Objective C files</p>
  
  <p>The function was easy, just to initialize a big number and use NSLog to print it out.</p>
  
  <p>I used</p>
  
  <pre><code>#import &lt;openssl/bn.h&gt;
  </code></pre>
  
  <p>but the xcode always displays me an error:</p>
  
  <p>openssl/bn.h: No such file or directory.</p>
  
  <p>I tried to find out if the .h file were missing, and typed locate in my terminal:</p>
  
  <blockquote>
    <p>$ locate bn.h <br>
    /Developer/SDKs/MacOSX10.6.sdk/usr/include/openssl/bn.h<br>
    /usr/include/openssl/bn.h<br>
    /usr/local/texlive/2010/texmf-dist/tex/generic/hyph-utf8/patterns/txt/hyph-bn.hyp.txt</p>
  </blockquote>
  
  <p>It seemed I have the bn.h file, but why the xcode kept me from compiling?</p>
  
  <p>Thanks for any help!!</p>