diff -ruN Mk1/Uses/bundle.mk Mk2/Uses/bundle.mk
--- Mk1/Uses/bundle.mk	1969-12-31 16:00:00.000000000 -0800
+++ Mk2/Uses/bundle.mk	2015-12-07 16:36:20.956465000 -0800
@@ -0,0 +1,29 @@
+# $FreeBSD$
+#
+# Provide support for the bundled projects
+#
+# Feature:	bundle
+# Usage:	USES=bundle
+#
+# MAINTAINER: portmgr@FreeBSD.org
+
+# BUNDLE      - set of bundled submodules in the form directory:group
+#               that will be extracted under WRKSRC.
+#               Extracted submodules should be present in DISTFILES.
+
+.if !defined(_INCLUDE_USES_BUNDLE_MK)
+_INCLUDE_USES_BUNDLE_MK=	yes
+
+_USES_extract+= 900:do-bundle
+do-bundle:
+	@${ECHO} "===>  Extracting bundled submodules for ${PKGNAME}"
+.for b in ${BUNDLE:C@.*:@@}
+	@[ -d ${WRKSRC}/${BUNDLE:M*\:${b}:C@:.*@@} ] || ${ECHO} "No directory for the bundle ${b}: ${WRKSRC}/${BUNDLE:M*\:${b}:C@:.*@@}"
+	@[ -n "${DISTFILES:M*\:${b}:C@:.*@@}" ] || ${ECHO} "No distfile for the bundle ${b}: ${DISTFILES:M*\:${b}:C@:.*@@}"
+	@${EXTRACT_CMD} ${EXTRACT_BEFORE_ARGS} ${DISTDIR}/${DISTFILES:M*\:${b}:C@:.*@@} \
+	  -C ${WRKSRC}/${BUNDLE:M*\:${b}:C@:.*@@} --strip 1;
+.endfor
+
+EXTRACT_ONLY=${DISTFILES:N*\:*}
+
+.endif