YYDEBUG 1} in the prologue of the grammar file (@pxref{Prologue, , The
Prologue}).
-If the @code{%define} variable @code{api.prefix} is used (@xref{Multiple
+If the @code{%define} variable @code{api.prefix} is used (@pxref{Multiple
Parsers, ,Multiple Parsers in the Same Program}), for instance @samp{%define
api.prefix x}, then if @code{CDEBUG} is defined, its value controls the
tracing feature (enabled iff nonzero); otherwise tracing is enabled iff