Compiling up some lex/yacc code, I get this:

cc1: warnings being treated as errors
lex.yy.c:1121: warning: `yyunput' defined but not used
*** Error code 1

*nowhere* is this function used or called (by my code).

I have other lex/yacc files which compile cleanly.  I'm
at a loss to explain the difference.

Clues, anyone ?

Darren