title: Xcode: cstdlib no member named "xxx" in the global namespace
body: <p><img src="https://i.stack.imgur.com/tVHHM.png" alt="enter image description here"></p>
  
  <p>I only change the search path to inform Xcode where opencv locates.
  Here's my search paths:</p>
  
  <pre><code>Framework search path: /usr/local/lib
  Library search path: /usr/local/Cellar/opencv/2.4.11/lib
                       /usr/local/Cellar/opencv/2.4.11_1/lib
                       /user/local/lib
  Header search path: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include
                      /usr/local/include
  </code></pre>
  
  <p>The errors:</p>
  
  <pre><code>    In file included from /Users/lilisun/Documents/opencv_projects/faceExtractor/faceExtractor/main.cpp:8:
  In file included from /usr/local/include/opencv2/objdetect/objdetect.hpp:46:
  In file included from /usr/local/include/opencv2/core/core.hpp:49:
  In file included from /usr/local/include/opencv2/core/types_c.h:55:
  In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/include/assert.h:44:
  In file included from /usr/local/include/c++/5.1.0/tr1/stdlib.h:32:
  In file included from /usr/local/include/c++/5.1.0/tr1/cstdlib:34:
  /usr/local/include/c++/5.1.0/cstdlib:118:11: error: no member named 'div_t' in the global namespace
    using ::div_t;
          ~~^
  /usr/local/include/c++/5.1.0/cstdlib:119:11: error: no member named 'ldiv_t' in the global namespace
    using ::ldiv_t;
          ~~^
  /usr/local/include/c++/5.1.0/cstdlib:121:11: error: no member named 'abort' in the global namespace
    using ::abort;
          ~~^
  /usr/local/include/c++/5.1.0/cstdlib:122:11: error: no member named 'abs' in the global namespace
    using ::abs;
          ~~^
  /usr/local/include/c++/5.1.0/cstdlib:123:11: error: no member named 'atexit' in the global namespace
    using ::atexit;
          ~~^
  /usr/local/include/c++/5.1.0/cstdlib:129:11: error: no member named 'atof' in the global namespace
    using ::atof;
          ~~^
  /usr/local/include/c++/5.1.0/cstdlib:130:11: error: no member named 'atoi' in the global namespace
    using ::atoi;
          ~~^
  /usr/local/include/c++/5.1.0/cstdlib:131:11: error: no member named 'atol' in the global namespace
    using ::atol;
          ~~^
  /usr/local/include/c++/5.1.0/cstdlib:132:11: error: no member named 'bsearch' in the global namespace
    using ::bsearch;
          ~~^
  /usr/local/include/c++/5.1.0/cstdlib:133:11: error: no member named 'calloc' in the global namespace
    using ::calloc;
          ~~^
  /usr/local/include/c++/5.1.0/cstdlib:134:11: error: no member named 'div' in the global namespace
    using ::div;
          ~~^
  /usr/local/include/c++/5.1.0/cstdlib:135:11: error: no member named 'exit' in the global namespace
    using ::exit;
          ~~^
  /usr/local/include/c++/5.1.0/cstdlib:136:11: error: no member named 'free' in the global namespace
    using ::free;
          ~~^
  /usr/local/include/c++/5.1.0/cstdlib:137:11: error: no member named 'getenv' in the global namespace
    using ::getenv;
          ~~^
  /usr/local/include/c++/5.1.0/cstdlib:138:11: error: no member named 'labs' in the global namespace
    using ::labs;
          ~~^
  /usr/local/include/c++/5.1.0/cstdlib:139:11: error: no member named 'ldiv' in the global namespace
    using ::ldiv;
          ~~^
  /usr/local/include/c++/5.1.0/cstdlib:140:11: error: no member named 'malloc' in the global namespace
    using ::malloc;
          ~~^
  /usr/local/include/c++/5.1.0/cstdlib:142:11: error: no member named 'mblen' in the global namespace
    using ::mblen;
          ~~^
  /usr/local/include/c++/5.1.0/cstdlib:143:11: error: no member named 'mbstowcs' in the global namespace
    using ::mbstowcs;
          ~~^
  fatal error: too many errors emitted, stopping now [-ferror-limit=]
  20 errors generated.
  </code></pre>