--- /var/repositories/gentoo/net-misc/l7-filter/l7-filter-2.13.ebuild	2007-08-09 10:22:39.000000000 +0200
+++ l7-filter-2.13-r1.ebuild	2007-09-25 15:04:33.000000000 +0200
@@ -19,6 +19,35 @@
 S=${WORKDIR}/${MY_P}
 RDEPEND="net-misc/l7-protocols"
 
+kernel_warning() {
+	ewarn "This may not work with all kernels. If it does not work please enter a bug at bugs.gentoo.org"
+	ewarn "This only patches the current kernel source code. (${KV_DIR})"
+	ewarn "Its up to you to recompile the kernel with the l7 options"
+	ewarn
+	ewarn "You will also need to emerge iptables with the \"extensions\" or"
+	ewarn "\"l7filter\" USE flag (depend which version of iptables you emerge)"
+}
+
+nf_ct_acct_check() {
+	ebegin "Checking for Connection tracking flow accounting support"
+	linux_chkconfig_present NF_CT_ACCT
+	eend $?
+
+	if [[ $? -ne 0 ]] ; then
+		ewarn "To successfully build the l7 patched kernel you need"
+		ewarn "Connection tracking flow accounting support."
+		ewarn 
+		ewarn "Please enable Connection tracking flow accounting support"
+		ewarn "in your kernel config, found at:"
+		ewarn
+		ewarn "  Networking"
+		ewarn "    Networking Options"
+		ewarn "      Network packet filtering framework (Netfilter)"
+		ewarn "        Core Netfilter Configuration"
+		ewarn "          [*] Connection tracking flow accounting"
+	fi
+}
+
 which_patch() {
 	if kernel_is ge 2 6 22
 	then
@@ -55,7 +84,7 @@
 pkg_setup() {
 	linux-info_pkg_setup
 	pkg_preinstall
-	pkg_postinst
+	kernel_warning
 }
 
 src_unpack() {
@@ -137,12 +166,8 @@
 }
 
 pkg_postinst() {
-	ewarn "This may not work with all kernels. If it does not work please enter a bug at bugs.gentoo.org"
-	ewarn "This only patches the current kernel source code. (${KV_DIR})"
-	ewarn "Its up to you to recompile the kernel with the l7 options"
-	ewarn
-	ewarn 'You will also need to emerge iptables with the "extensions" or'
-	ewarn '"l7filter" USE flag (depend which version of iptables you emerge)'
+	kernel_warning
+	nf_ct_acct_check
 }
 
 #