p5-net-nfdump @1.25: error: implicit declaration of function 'ff2_lex' is invalid in C99

[ryandesign (Ryan Carsten Schmidt)]

​https://build.macports.org/builders/ports-11_arm64-builder/builds/1001/steps/install-port/logs/stdio

ffilter/ffilter_gram.c:1369:16: error: implicit declaration of function 'ff2_lex' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
      yychar = YYLEX;
               ^
ffilter/ffilter_gram.c:692:16: note: expanded from macro 'YYLEX'
# define YYLEX yylex (&yylval, scanner, filter)
               ^
ffilter/ffilter_gram.c:64:25: note: expanded from macro 'yylex'
#define yylex           ff2_lex
                        ^
1 error generated.

A new version is available so updating to that would be a good first thing to try.