Once you have a script name in the Build script pane, build your application by choosing
Works > Build > Build
or clicking the 
toolbar button. The Application Builder invokes LispWorks in a subprocess, with the script as its -build argument.
If desired, you can abort the build process by pressing the Abort button.
The State pane displays the status of the building operation. After a successful build, the status changes to "Done" and the tool displays the name and size of the saved image in the Saved Image and Size panes, as shown in The Application Builder after a successful build below.
Figure 30.3 The Application Builder after a successful build
LispWorks IDE User Guide (Windows version) - 13 Sep 2017