title: Clang: symbols not found. cocos2d mac
body: <p>When i compile my cocos2d mac project i get this error:</p>
  
  <pre><code>Undefined symbols for architecture x86_64:
  "_inflateInit2_", referenced from:
    _ccInflateMemoryWithHint in ZipUtils.o
  "_inflate", referenced from:
    _ccInflateMemoryWithHint in ZipUtils.o
  "_inflateEnd", referenced from:
    _ccInflateMemoryWithHint in ZipUtils.o
  "_gzopen", referenced from:
    _ccInflateGZipFile in ZipUtils.o
  "_gzread", referenced from:
    _ccInflateGZipFile in ZipUtils.o
  "_gzclose", referenced from:
    _ccInflateGZipFile in ZipUtils.o
  "_uncompress", referenced from:
    _ccInflateCCZFile in ZipUtils.o
  
  ld: symbol(s) not found for architecture x86_64
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>