configure: fix macports flex version detection

Macports add extra information after version itself:

$flex --version
flex 2.5.35 Apple(flex-31)

We require at least felx 2.5.35 so do not need to care about prehistoric
"flex version n.n.n"; just use second field always.

Reported by Peter Cheung <mcheung63@hotmail.com>

diff --git a/configure.ac b/configure.ac
index 9e8a606..3300545 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -315,7 +315,7 @@ AC_PROG_LN_S
 if test "x$LEX" = "x:"; then
   AC_MSG_ERROR([flex is not found])
 else
-  version=`$LEX --version | $AWK '{ split($NF,x,"."); print x[[1]]*10000+x[[2]]*100+x[[3]]; }'`
+  version=`$LEX --version | $AWK '{ split($2,x,"."); print x[[1]]*10000+x[[2]]*100+x[[3]]; }'`
   if test -n "$version" -a "$version" -ge 20535; then
     :
   else