%define variable 'parse.trace' is not used

[Maxim Filipenko]

Hi all!

If I specify "%define parse.trace" or -t option to bison with explicit relative 
path to glr.c skeleton with -S option or "%skeleton 
relative_path_to_local_file" directive, I get error "%define variable 
'parse.trace' is not used". If I specify glr.c from installation directory 
(just "glr.c"), then error is missing. Without trace options in both cases 
(relative path and installation directory) parser generates the same .cc file.  

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Filipenko Maxim