[Boost-build] Conditional dependencies?

From: John Maddock (john_at_[hidden])
Date: 2008-05-20 07:50:04

Is it possible to have a dependency conditional on whether another target 
builds or not?

Basically what I want is "if test case X builds OK, then include library Y 
in the source dependencies of the project, otherwise don't include it."

Thanks, John.