[ns] Variable debug_

[Sven Ostring <ostrinsa@elec.canterbury.ac.nz>]

I'm getting the following warning

warning: no class variable ClassExample::debug_

        see tcl-object.tcl in tclcl for info about this warning.

for classes that I'm developing.  How can avoid these warnings -
by #include object.h or some other method?

Thanks,
Sven.