[Boost-users] [boost-build]how to configure custom targets

Hello, I am trying to roll out my own main target (essentially to create plots using gnuplots). The tutorial example/customization was helpful and modifications at appropriate places does the required job. However the output-file is generated on "bin/gcc-4.2/debug". How can I change this so that it outputs to plots/ subdirectory. My second concern is that bjam executes the rule even if the end target is up-to-date. How to fix this. Thanks, Sandeep