title: Crashlytics and XCode 6.3 - unable to find 'codesign' tool via xcrun
body: <p>My app archive is created successfully, but Crashlytics fails to upload it for testing, and provides the following messages:</p>
  
  <pre><code>Unable to find 'codesign' tool via xcrun
  
  Make sure that command line developer tools are installed and that `xcode-select` 
  is pointing to a valid developer directory.
  </code></pre>
  
  <p>Command line tools are installed. XCode->Preferences->Locations is pointing to XCode 6.3 tools.</p>
  
  <p><code>xcode-select -p</code> displays <code>/Applications/Xcode-6.3.app/Contents/Developer</code>, which is a valid developer directory.</p>
  
  <p>Any ideas? Crashlytics guys, are you out there?</p>