--- configure.orig	2015-10-06 03:19:44.000000000 +0800
+++ configure	2022-05-31 00:50:54.000000000 +0800
@@ -6931,17 +6931,17 @@
         echo '%%'  > conftest.l
         if $pgac_candidate -t conftest.l 2>/dev/null | grep FLEX_SCANNER >/dev/null 2>&1; then
           pgac_flex_version=`$pgac_candidate --version 2>/dev/null`
-          if echo "$pgac_flex_version" | sed 's/[.a-z]/ /g' | $AWK '{ if ($1 = 2 && $2 = 5 && $3 >= 31) exit 0; else exit 1;}'
+          if echo "$pgac_flex_version" | sed 's/[.a-z]/ /g' | $AWK '{ if ($1 = 2 && $2 >= 6 && $3 >= 0) exit 0; else exit 1;}'
           then
             pgac_cv_path_flex=$pgac_candidate
             break 2
           else
             { $as_echo "$as_me:$LINENO: WARNING:
 *** The installed version of Flex, $pgac_candidate, is too old to use with PostgreSQL.
-*** Flex version 2.5.31 or later is required, but this is $pgac_flex_version." >&5
+*** Flex version 2.6.0 or later is required, but this is $pgac_flex_version." >&5
 $as_echo "$as_me: WARNING:
 *** The installed version of Flex, $pgac_candidate, is too old to use with PostgreSQL.
-*** Flex version 2.5.31 or later is required, but this is $pgac_flex_version." >&2;}
+*** Flex version 2.6.0 or later is required, but this is $pgac_flex_version." >&2;}
           fi
         fi
       fi