I've written a build step that sets a TC property based on a value in a file (in this case the jruby interpreter version is being extracted from a Gemfile). I'd like to use this property to configure either the Ruby interpreter in a later Rake build step or to configure the Ruby Environment Configurator interpreter overall. However, in either case, when I set the interpreter to a variable, the configuration expects that variable to be set otherwise no agents are assigned. If I set a default value for that variable, agents will be assigned, but that value will not be overwritten. Any thoughts on if the Ruby interpreter can be set dynamically?