rem: argmatch_invalid (const char *context, const char *value, int problem)
add: argmatch_invalid (const char *context, const char *value, ptrdiff_t problem)
context: argmatch_invalid (const char *context, const char *value, int problem){  char const *format = (problem == -1			? _("invalid argument %s for %s")			: _("ambiguous argument %s for %s"));  error (0, 0, format, quotearg_n_style (0, ARGMATCH_QUOTING_STYLE, value),	 quote_n (1, context));}