title: "Unresolved inclusion" error with Eclipse CDT for C standard library headers
body: <p>I set up CDT for eclipse and wrote a simple hello world C program:</p>
  <pre><code>#include &lt;stdio.h&gt;
  
  int main(void){
      puts(&quot;Hello, world.&quot;);
      return 0;
  }
  </code></pre>
  <p>The program builds and runs correctly, but eclipse keeps showing this yellow question mark by the side of inclusion statement that says <code>&quot;Unresolved inclusion: &lt;stdio.h&gt;&quot;</code> when I put mouse over it.</p>
  <p>It doesn't affect running of the program but I find it rather annoying.</p>
  <p>Does anyone have any idea how to remove it?</p>