title: stdio.h not found after fresh xcode 4.3 installed
body: <p>After upgrading to Lion, and installing XCode 4.3 I can't get "Hello, World" to compile.   </p>
  
  <pre><code>include &lt;stdio.h&gt;
  
  int
  main ( int argc, char *argv[]) {
  
      printf("Hello, World!\n");
  }
  
  
  $ gcc hello.c 
  hello.c:1:19: error: stdio.h: No such file or directory
  </code></pre>
  
  <p>I see a stdio.h in ./SDKs/MacOSX10.6.sdk/usr/include/stdio.h, but it's a little surprising
  that there isn't a 10.7 version.  Did my install fail?  It reported success.</p>
  
  <p>The standard solution to this problem, after some Googling, is to reinstall XCode.  But XCode is delivered through the App store with doesn't give me a re-install option. I also never saw the various other options such as "Unix development" which are referenced in other places.</p>
  
  <p>Ideas?</p>