Force a failure step

[Too_Tall_Crown_Victoria]

I am calling a DOS batch file, that compiles some code. If the compile succeeds or fails the batch file completes successfully. I have written the step that will check the output and look for the failure.

My question is how can I call a Failure step or force a failure if I determine that my compile did fail by looking at the output? I want to stop the build until the problem can be resolved, but the build runs automaticlly at night.

Thanks

Tom