21.5.31: strange widget message startup

[Stephen J. Turnbull]

Uwe Brauer writes:
 > Hello
 > 
 > After having compiled and installed 21.5.31, I obtain the
 > following warning 
 > 
 > Is this serious?

No -- it just means that to customize those variables you need to know
their names since they won't appear in a custom group list.  I don't
know why you're getting this warning, though.  I suppose it's
something particular to your setup, because I don't see it.