1AC_DEFUN([PDNS_CHECK_FLEX], [ 2 AC_PROG_LEX(noyywrap) 3 AC_REQUIRE([AC_PROG_EGREP]) 4 5 AC_CACHE_CHECK([if the lexer is flex],[pdns_cv_prog_flex],[ 6 AS_IF([$LEX --version 2>/dev/null | $EGREP -q '^flex '], 7 [pdns_cv_prog_flex=yes], [pdns_cv_prog_flex=no]) 8 ]) 9 10 AS_IF([test "x$pdns_cv_prog_flex" = "xno"], [ 11 AS_IF([test ! -f "${srcdir}/pdns/bindlexer.c"], 12 [AC_MSG_ERROR([flex is missing and you don't have ${srcdir}/pdns/bindlexer.c. Please install flex])] 13 )] 14 ) 15]) 16