maintainer-feedback requested: [Bug 237917] graphics/libGLw: Should glwMDrawingAreaWidgetClass be declared as extern?

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Bug 237917: graphics/libGLw: Should glwMDrawingAreaWidgetClass be declared as
extern?
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237917



--- Description ---
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.