diff --git a/INSTALL b/INSTALL
index a1e3a77..924889c 100644
--- a/INSTALL
+++ b/INSTALL
@@ -14,7 +14,7 @@ Supported configurations for this release
 
 	* iptables >= 1.4.3
 
-	* kernel-source >= 2.6.17, no upper bound known
+	* kernel-source >= 2.6.29
 	  with prepared build/output directory
 	  - CONFIG_NF_CONNTRACK or CONFIG_IP_NF_CONNTRACK
 	  - CONFIG_NF_CONNTRACK_MARK or CONFIG_IP_NF_CONNTRACK_MARK
@@ -22,12 +22,6 @@ Supported configurations for this release
 	  - CONFIG_CONNECTOR y/m if you wish to receive userspace
 	    notifications from pknock through netlink/connector
 
-Extra notes:
-
-	* in the kernel 2.6.18.x series, >= 2.6.18.5 is required
-
-	* requires that no vendor backports interfere
-
 For ipset-5 you need:
 
 	* libmnl
diff --git a/configure.ac b/configure.ac
index 80006a6..0565050 100644
--- a/configure.ac
+++ b/configure.ac
@@ -40,15 +40,6 @@ regular_CFLAGS="-Wall -Waggregate-return -Wmissing-declarations \
 	-Wmissing-prototypes -Wredundant-decls -Wshadow -Wstrict-prototypes \
 	-Winline -pipe";
 
-#
-# check kernel version
-#
-if grep -q "CentOS release 5\." /etc/redhat-release 2>/dev/null ||
-    grep -q "Red Hat Enterprise Linux Server release 5" /etc/redhat-release 2>/dev/null; then
-	# しまった!
-	# Well, just a warning. Maybe the admin updated the kernel.
-	echo "WARNING: This distribution's shipped kernel is not supported.";
-fi;
 if test -n "$kbuilddir"; then
 	AC_MSG_CHECKING([kernel version that we will build against])
 	krel="$(make -sC "$kbuilddir" M=. kernelrelease)";
@@ -72,13 +63,17 @@ if test -n "$kbuilddir"; then
 		echo "$kmajor.$kminor.$kmicro.$kstable in $kbuilddir";
 		if test "$kmajor" -gt 2 -o "$kminor" -gt 6 -o "$kmicro" -gt 38; then
 			echo "WARNING: You are trying a newer kernel. Results may vary. :-)";
+		elif test "$kmajor" -eq 2 -a "$kminor" -eq 6 -a "$kmicro" -ge 29; then
+			:; # everything ok
 		elif test \( "$kmajor" -lt 2 -o \
 		    \( "$kmajor" -eq 2 -a "$kminor" -lt 6 \) -o \
 		    \( "$kmajor" -eq 2 -a "$kminor" -eq 0 -a "$kmicro" -lt 17 \) -o \
 		    \( "$kmajor" -eq 2 -a "$kminor" -eq 6 -a "$kmicro" -eq 18 -a \
 		    "$kstable" -lt 5 \) \); then
-			echo "ERROR: That kernel version is not supported. Please see INSTALL for minimum configuration.";
+			echo "ERROR: That kernel version is not supported at all. Please see INSTALL for minimum configuration.";
 			exit 1;
+		else
+			echo "WARNING: That kernel version has been recently deprecated for use with Xtables-addons). Compilation may fail.";
 		fi;
 	fi;
 fi;