title: Mac OS X 10.9, Cannot find appropriate C compiler on this system when install cmake
body: <p>I'm trying to install cmake in MAC OS X 10.9, and get error log below:</p>
  
  <pre><code>Error when bootstrapping CMake:
  Cannot find appropriate C compiler on this system.
  Please specify one using environment variable CC.
  See cmake_bootstrap.log for compilers attempted.
  </code></pre>
  
  <p>but i've installed gcc in my os:</p>
  
  <pre><code>localhost:cmake-2.8.11.2 markyoung$ gcc --help
  Usage: i686-apple-darwin11-llvm-gcc-4.2 [options] file...
  Options:
    -pass-exit-codes         Exit with highest error code from a phase
    --help                   Display this information
    --target-help            Display target specific command line options
  ...
  </code></pre>
  
  <p>How can I solve the problem?</p>