How can I enable breakpoints in Eclipse/CDT

Question

I'm using Eclipse 3.5.1 on Ubuntu 9.10, with CDT 1.0.0.200909110608

If I right-click the left margin for a context menu, Toggle Breakpoint, Enable Breakpoint and Breakpoint Properties are all grayed-out.

How can I enable these?

Apart from breakpoints, the debugger and the rest of CDT are working fine.

Answer 1

Check Run->Breakpoint Types->C/C++ Breakpoints