title: SDKROOT path for latest SDK
body: <p>I am using Xcode to build an old code and specify <code>SDKROOT=/Developer/SDKs/MacOSX"${HOST_VERSION}".sdk/</code></p>
  
  <p>I want to specify SDKROOT for latest SDK that comes pre-installed (?) on the system. e.g. I am on <code>10.8</code> already and I want to specify <code>SDKROOT</code> with -syslibroot, but there is no such SDK in <code>/Developer/SDKs/</code>. Should i just ignore syslibroot altogether if <code>SDK_VERSION == HOST_VERSION</code>?</p>