title: cc1plus: some warnings being treated as errors
body: <p>In system:
  Fedora 21
  Ruby 2.1.7
  GCC 4.9.2</p>
  
  <p>I follow the instructions for installing <a href="http://www.chokkan.org/software/simstring/" rel="nofollow">simstring</a> but afer</p>
  
  <blockquote>
    <p>$ruby extconf.rb </p>
  </blockquote>
  
  <p>when trying to make and make install, I got an error:</p>
  
  <pre><code>cc1plus: some warnings being treated as errors
  Makefile:217: recipe for target 'export_wrap.o' failed
  make: *** [export_wrap.o] Error 1
  </code></pre>
  
  <p>And the entire log of this error is bellow</p>
  
  <p><a href="https://gist.github.com/aliabbaC/1fdb50d8e63197d8bf5b0ae4c119fa0c" rel="nofollow">Error Log</a></p>
  
  <p>I searched about this error but all of replies are about how to disable Werrors and configure with ignoring werrors.
  Is there any solution?I think something not mentioned but i don't know what..</p>