title: Qt requires C++11 support
body: <p>I used Qt 5.7 and gcc 4.9.2. Qt Core module throw <code>Qt requires C++11 support</code> error.</p>
  
  <p><a href="https://wiki.qt.io/Qt_5.7.0_Known_Issues" rel="noreferrer">This page</a> say that  </p>
  
  <blockquote>
    <p>gcc 4.9.2 fails to compile Qt.</p>
  </blockquote>
  
  <p>So I installed gcc 4.8. I check using below command on terminal : </p>
  
  <pre><code>$ g++ --version
  g++ (Ubuntu 4.8.4-1ubuntu15) 4.8.4
  </code></pre>
  
  <p>My kit uses cmake not qmake. I add  <code>TARGET_LINK_LIBRARIES ( xxxx yyyy /usr/bin/c++ -std=c++11</code>  to CMakeLists-txt. </p>
  
  <p>I restart my pc and run my application again. Same error is throwed.</p>
  
  <pre><code>/opt/Qt/5.7/gcc_64/include/QtCore/qbasicatomic.h:61: error: #error "Qt requires C++11 support"
   #  error "Qt requires C++11 support"
      ^
  </code></pre>
  
  <p>How can I solve it?</p>