title: eclipse cdt - change type of project
body: <p>I have a bunch of Eclipse projects imported into my workspace. 
  I know how to add a directory for Eclipse to search for headers to resolve symbols.</p>
  
  <p>However, some of my projects do not allow me to add these directories and I realized that it's because those projects are not the correct type.</p>
  
  <p><strong>Right click > Properties</strong> on the 'correct' type of project shows an item in the list called "<strong>C/C++ Build</strong></p>
  
  <p>If it has this entry, then in <strong>C/C++ General</strong> it has an entry called <strong>Paths and Symbols</strong> wherein I can add necessary include directories so that the indexing works.</p>
  
  <p><strong>QUESTION</strong></p>
  
  <p>How do I change the properties of this project so I can use indexing and add directories for indexing?</p>
  
  <p>I've found one thing that obviously needs to be changed: in the 'correct' project, <strong>Right Click > Properties > Builders</strong> has two entries: <strong>CDT Builder</strong> and <strong>Scanner Configuration Builder</strong> while the 'incorrect' project is missing these two.</p>
  
  <p>How do I add them? 
  <strong>Import</strong> yields a blank page and <strong>New</strong> is just as useless.</p>