Index: dahdi-2.2.0.2.ebuild
===================================================================
--- dahdi-2.2.0.2.ebuild	(revision 65)
+++ dahdi-2.2.0.2.ebuild	(revision 67)
@@ -19,7 +19,7 @@
 LICENSE="LGPL-2.1"
 SLOT="0"
 KEYWORDS="~amd64 ~x86"
-IUSE=""
+IUSE="ecoslec"
 
 DEPEND=""
 RDEPEND=""
@@ -51,6 +51,15 @@
 	# GCC 4.4 compatibility, the quick 'n dirty way
 	# error: dereferencing pointer to incomplete type
 	epatch "${FILESDIR}"/${P}-gcc44-hack.patch
+
+	if use ecoslec; then
+		elog "Support for OSLEC echo canceller."
+		mkdir "${MY_P}/drivers/staging" || die "Error creating staging folder."
+		cp -a "${KERNEL_DIR}/drivers/staging/echo" "${MY_P}/drivers/staging/" \
+			|| die "Error copying staging/echo folder"
+		sed -re 's,^#(obj-m \+= (dahdi_echocan_oslec.o|\.\./staging/echo/))$,\1,' -i "${MY_P}/drivers/dahdi/Kbuild" \
+			|| die "Error enabling OSLEC"
+	fi
 }
 
 src_compile() {
@@ -69,3 +78,11 @@
 	emake KSRC="${KERNEL_DIR}" DESTDIR="${D}" install || die "Installation failed"
 	rm -rf "$D"/lib/modules/*/modules.*
 }
+
+pkg_postinst() {
+	if use ecoslec && linux-info_get_any_version && linux_config_src_exists; then
+		CONFIG_CHECK="~ECHO"
+		local ERROR_ECHO="You need CONFIG_ECHO enabled in your kernel sources in order to use oslec support."
+		check_extra_config
+	fi
+}