title: c++ include redeclaration
body: <p>I have two libraries in my include path:</p>
  
  <pre><code>/usr/local/include/lib1/
  /user/include/lib2/
  </code></pre>
  
  <p>Both define a header file "vec.h" and I get the following error:</p>
  
  <pre><code>/usr/local/include/lib1/vec.h:22: error: redeclared with...
  </code></pre>
  
  <p>How to handle this?</p>