title: How can I enable breakpoints in Eclipse/CDT
body: <p>I'm using <code>Eclipse 3.5.1</code> on <code>Ubuntu 9.10</code>, with <code>CDT 1.0.0.200909110608</code></p>
  
  <p>If I right-click the left margin for a context menu, <code>Toggle Breakpoint</code>, <code>Enable Breakpoint</code> and <code>Breakpoint Properties</code> are all grayed-out.</p>
  
  <p>How can I enable these?</p>
  
  <p>Apart from breakpoints, the debugger and the rest of CDT are working fine.</p>