title: C++ Error 'nullptr was not declared in this scope' in Eclipse IDE
body: <p>I am running Eclipse Helios and I have g++-4.6 installed. Hope I am not wrong that g++4.6 implements C++ 11 features. I have created a C++ project which uses the nullptr and auto keywords. The build gives the following errors:-</p>
  
  <pre><code>../{filename}.cpp:13:13: error: ‘nullptr’ was not declared in this scope
  
  ../{filename}.cpp:14:2: warning: ‘auto’ will change meaning in C++0x; please remove it [-Wc++0x-compat]
  </code></pre>
  
  <p>Actually it was building fine until yesterday. I am getting these from nowhere today. Please help me solve this problem.</p>