Autoconf test for incompatible version of flex

This patch adds an autoconf test to check for the new incompatible version of
flex.

--- programs.m4.~1.12.~ 2003-05-06 19:33:52.000000000 -0400
+++ programs.m4 2003-07-04 20:45:47.000000000 -0400
@@ -30,6 +30,10 @@
pgac_broken_flex=$pgac_candidate
continue
fi
+ if $pgac_candidate --version | grep ' 2\.5\.[[3-9][0-9]]$' >/dev/null 2>&1; then
+ pgac_new_flex=$pgac_candidate
+ continue
+ fi

pgac_cv_path_flex=$pgac_candidate
break 2
@@ -49,6 +53,12 @@
*** The Flex version 2.5.3 you have at $pgac_broken_flex contains a bug. You
*** should get version 2.5.4 or later.])
fi
+ if test -n "$pgac_new_flex"; then
+ AC_MSG_WARN([
+*** The Flex version you have at $pgac_new_flex is a version PostgreSQL does
+*** not support. There were major incompatible API changes in this release of
+*** Flex. To compile PostgreSQL you should get version no later than 2.5.4a.])
+ fi

AC_MSG_WARN([
*** Without Flex you will not be able to build PostgreSQL from CVS or

--
greg