4 # This macro verifies that Bison is installed. If successful, then
5 # 1) YACC is set to bison -y (to emulate YACC calls)
6 # 2) BISON is set to bison
8 AC_DEFUN([AC_PROG_BISON],
13 if test "$YACC" != "bison -y"; then
14 AC_MSG_ERROR([bison not found but required])
16 AC_SUBST(BISON,[bison],[location of bison])