title: What is causing this Visual Studio Pro 2013 Warning?
body: <p>Every time I build my project my Build output window is filled (one instance for every cpp file) with </p>
  
  <pre><code>1&gt;d:\program files\microsoft sdks\windows\v7.1\include\sal_supp.h(57): warning C4005: '__useHeader' : macro redefinition
  1&gt;          d:\program files\microsoft visual studio 12.0\vc\include\sal.h(2886) : see previous definition of '__useHeader'
  1&gt;d:\program files\microsoft sdks\windows\v7.1\include\specstrings_supp.h(77): warning C4005: '__on_failure' : macro redefinition
  1&gt;          d:\program files\microsoft visual studio 12.0\vc\include\sal.h(2896) : see previous definition of '__on_failure'
  </code></pre>
  
  <p>It's not really a problem except that it makes it hard to parse the actual build errors when I break something. How can I fix the root of this error? Or at least silence it?</p>