title: Homebrew cannot find installed command line tools
body: <p>I have installed command line tools through Xcode. When I ran <code>xcode-select -p</code>, its showed <code>/Applications/Xcode.app/Contents/Developer</code>.</p>
  
  <p>However, when I ran <code>brew config</code>, it showed <code>CLT: N/A</code>. And when I updated python using brew, it showed <code>Warning: Building python from source: The bottle needs the Apple Command Line Tools to be installed.</code></p>