On Unix® platforms, when you plan to link your application with Views, you have to decide whether or not it will include pure Motif® code. If this is the case, then you need to link with libmviews.

If you need your application to be a pure Xlib application, then you need to link with libxviews.

Never link with both, and always link with one of these two. The library "views" is likely to be necessary for every application.