1AC_DEFUN([PDNS_CHECK_BISON], [ 2 AC_REQUIRE([AC_PROG_YACC]) 3 AC_REQUIRE([AC_PROG_EGREP]) 4 5 AC_CACHE_CHECK([if bison is the parser generator],[pdns_cv_prog_bison],[ 6 AS_IF([$YACC --version 2>/dev/null | $EGREP -q '^bison '], 7 [pdns_cv_prog_bison=yes], [pdns_cv_prog_bison=no]) 8 ]) 9 10 AS_IF([test "x$pdns_cv_prog_bison" = "xno"], [ 11 AS_IF([test ! -f "${srcdir}/pdns/bindparser.cc"], 12 [AC_MSG_ERROR([bison is missing and you don't have ${srcdir}/pdns/bindparser.cc. Please install bison])] 13 )] 14 ) 15]) 16