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diff --git a/classes/srctree.bbclass b/classes/srctree.bbclass
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+# Copyright (C) 2009 Chris Larson <clarson@kergoth.com>
+# Released under the MIT license (see COPYING.MIT for the terms)
+#
+# srctree.bbclass enables operation inside of an existing source tree for a
+# project, rather than using the fetch/unpack/patch idiom.
+#
+# By default, it expects that you're keeping the recipe(s) inside the
+# aforementioned source tree, but you could override S to point at an external
+# directory and place the recipes in a normal collection/overlay, if you so
+# chose.
+#
+# It also provides some convenience python functions for assembling your
+# do_clean, if you want to leverage things like 'git clean' to simplify the
+# operation.
+
+
+S = "${FILE_DIRNAME}"
+SRC_URI = ""
+
+#TYPE = "${@'${PN}'.replace('${BPN}', '').strip()}"
+#WORKDIR = "${S}/tmp${TYPE}.${MULTIMACH_HOST_SYS}"
+#STAMP = "${WORKDIR}/tasks/stamp"
+#WORKDIR_LOCAL = "${S}/tmp${TYPE}.${MULTIMACH_HOST_SYS}"
+#T = "${WORKDIR_LOCAL}/bitbake-tasks"
+
+# Hack, so things don't explode in builds that don't inherit package
+do_package ?= "    pass"
+do_package[func] = "1"
+do_package[python] = "1"
+
+# Ensure that do_package depends on populate_staging, rather than install
+addtask package after do_populate_staging
+
+# This stuff is needed to facilitate variants (normal, native, cross, sdk)
+# that share a ${S}.  It's ugly as hell.  Only really necessary for recipes
+# that can't use a ${B}, and which have variants like native.  Not sure what
+# the best solution is long term.
+#
+# We merge configure+compile+install into the populate_staging task, uses a
+# lock file.  This ensures that none of the tasks which access ${S} can
+# interleave amongst the recipes that share that ${S}.
+
+def variant_hack(d):
+	from itertools import chain
+
+	# Kill dependencies on the fromtasks
+	fromtasks = ["do_configure", "do_compile", "do_install"]
+	for key in d.keys():
+		task = d.getVarFlag(key, "task")
+		if task:
+			deps = d.getVarFlag(key, "deps")
+			for task_ in fromtasks:
+				if task_ in deps:
+					deps.remove(task_)
+			# if not key in fromtasks + ["do_populate_staging"]:
+			#	 deps.append("do_populate_staging")
+			d.setVarFlag(key, "deps", deps)
+
+	# Pull the task deps from fromtasks over to the new task, minus deltasks
+	deltasks = ("do_patch", "do_unpack", "do_fetch")
+	deps = set(chain(*[(d.getVarFlag(old, "deps")) for old in fromtasks + ["do_populate_staging"]]))
+	d.setVarFlag("do_populate_staging", "deps", deps.difference(deltasks))
+
+	# Pull cross recipe task deps over
+	d.setVarFlag("do_populate_staging", "depends", " ".join((d.getVarFlag(old, "depends") or "" for old in fromtasks)))
+
+python () {
+	variant_hack(d)
+}
+
+python do_populate_staging () {
+	from bb.build import exec_task, exec_func
+
+	exec_task("do_configure", d)
+	exec_task("do_compile", d)
+	exec_task("do_install", d)
+	exec_func("do_stage", d)
+}
+do_populate_staging[lockfiles] += "${S}/.lock"
+
+make_do_clean () {
+	oe_runmake clean
+}
+
+def clean_builddir(d):
+	from shutil import rmtree
+
+	builddir = d.getVar("B", True)
+	srcdir = d.getVar("S", True)
+	if builddir != srcdir:
+		rmtree(builddir, ignore_errors=True)
+
+def clean_stamps(d):
+	from glob import glob
+	from bb import note
+	from bb.data import expand
+	from os import unlink
+
+	note("Removing stamps")
+	for stamp in glob(expand('${STAMP}.*', d)):
+		try:
+			unlink(stamp)
+		except OSError:
+			pass
+
+def clean_workdir(d):
+	from shutil import rmtree
+	from bb import note
+
+	workdir = d.getVar("WORKDIR", 1)
+	note("Removing %s" % workdir)
+	rmtree(workdir, ignore_errors=True)
+
+def clean_git(d):
+	from subprocess import call
+
+	call(["git", "clean", "-d", "-f", "-X"], cwd=d.getVar("S", True))
+
+def clean_make(d):
+	import bb
+
+	bb.note("Running make clean")
+	try:
+		bb.build.exec_func("make_do_clean", d)
+	except bb.build.FuncFailed:
+		pass
+
+python do_clean () {
+	from os.path import exists
+	from bb.build import FuncFailed
+	from bb.data import expand
+
+	clean_stamps(d)
+	clean_workdir(d)
+	if exists(expand("${S}/.git", d)) and \
+	   exists(expand("${S}/.gitignore", d)):
+		clean_git(d)
+	else:
+		clean_builddir(d)
+		clean_make(d)
+}