[Bug 237917] graphics/libGLw: Should glwMDrawingAreaWidgetClass be declared as extern?

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237917

            Bug ID: 237917
           Summary: graphics/libGLw: Should glwMDrawingAreaWidgetClass be
                    declared as extern?
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: [email protected]
          Reporter: [email protected]
          Assignee: [email protected]
             Flags: maintainer-feedback?([email protected])

Error message from SUMA (part of science/afni)

** ERROR: glwMDrawingAreaWidgetClass is NULL
   This might be an error in GLwDrawA.h where the class is
   not referenced using 'extern'.  An alternative is to use
   the local build of libGLws.a.

Adding extern to the declaration in /usr/local/include/GL/GLwDrawA.h did
eliminate the error.

Would probably do the same for glwDrawingAreaWidgetClass.

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