// builder is not added to the .project, so here we force it to be added.
IProjectNature nature = project.getNature(RubyNature.NATURE_ID);
nature.configure();
IScriptProject scriptProject = DLTKCore.create(project);
scriptProject.makeConsistent(null);
scriptProject.save(null, false);
}
// that last block doesn't seem to flush the previous interpreter's
// completions... must be some other way to do that.