I've got some errors when building yacc generated source in sh and ftpd:

cc -O -DSHELL -I. -I/usr/src/bin/sh  -Werror -Wall -Wstrict-prototypes
-Wmissing-prototypes  -c arith.c
cc1: warnings being treated as errors
y.tab.c:395: warning: function declaration isn't a prototype
y.tab.c: In function `yyparse':
y.tab.c:497: warning: label `yyerrlab' defined but not used
y.tab.c:492: warning: label `yynewerror' defined but not used
arith.c: At top level:
arith.c:5: warning: `yyrcsid' defined but not used
*** Error code 1


   /Krister