AC_ARG_VAR([BISON], [Command to invoke GNU Bison. Defaults to bison.])
AC_ARG_VAR([BISONFLAGS], [Additional options to pass to Bison.])
AC_CHECK_PROGS([BISON], [bison], [bison])
AC_ARG_VAR([BISON], [Command to invoke GNU Bison. Defaults to bison.])
AC_ARG_VAR([BISONFLAGS], [Additional options to pass to Bison.])
AC_CHECK_PROGS([BISON], [bison], [bison])