Building widgetset for vaadin 7


I’m trying to migrate project from 6 to 7. We have some add-ons from this site witch wants to rebuild widgetset for it. We are using gradle, but in vaadin6 we are building widgetset with gwt-240.jar in IntelliJ Idea, using facets. Now it is impossible, becouse Plug-in for gradle is not work becouse it have some problems with jetty8 dependencies. What can you advice for me?