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diff --git a/meta-oe/classes/srctree.bbclass b/meta-oe/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.
+
+
+# Grab convenience methods & sane default for do_clean
+inherit clean
+
+# Build here
+S = "${FILE_DIRNAME}"
+SRC_URI = ""
+
+def remove_tasks(deltasks, d):
+    for task in filter(lambda k: d.getVarFlag(k, "task"), d.keys()):
+        deps = d.getVarFlag(task, "deps")
+        for preptask in deltasks:
+            if preptask in deps:
+                deps.remove(preptask)
+        d.setVarFlag(task, "deps", deps)
+
+addtask configure after do_setscene
+
+def merge_tasks(d):
+    """
+    Merges all of the operations that occur prior to do_populate_sysroot
+    into do_populate_sysroot.
+
+    This is necessary because of recipe variants (normal, native, cross,
+    sdk).  If a bitbake run happens to want to build more than one of
+    these variants in a single run, it's possible for them to step on one
+    another's toes, due to the shared ${S}.  Interleaved
+    configure/compile/install amongst variants will break things badly.
+    """
+    from itertools import chain
+    from bb import note
+
+    def __gather_taskdeps(task, seen):
+        for dep in d.getVarFlag(task, "deps"):
+            if not dep in seen:
+                __gather_taskdeps(dep, seen)
+        if not task in seen:
+            seen.append(task)
+
+    def gather_taskdeps(task):
+        items = []
+        __gather_taskdeps(task, items)
+        return items
+
+    newtask = "do_populate_sysroot_post"
+    mergedtasks = gather_taskdeps(newtask)
+    mergedtasks.pop()
+
+    for task in (key for key in d.keys()
+                 if d.getVarFlag(key, "task") and
+                 not key in mergedtasks):
+        deps = d.getVarFlag(task, "deps")
+        for mergetask in mergedtasks:
+            if mergetask in (d.getVarFlag(task, "recrdeptask"),
+                             d.getVarFlag(task, "recdeptask"),
+                             d.getVarFlag(task, "deptask")):
+                continue
+
+            if mergetask in deps:
+                deps.remove(mergetask)
+                #note("removing dep on %s from %s" % (mergetask, task))
+
+                if not newtask in deps:
+                    #note("adding dep on %s to %s" % (newtask, task))
+                    deps.append(newtask)
+        d.setVarFlag(task, "deps", deps)
+
+    # Pull cross recipe task deps over
+    depends = []
+    deptask = []
+    for task in mergedtasks[:-1]:
+        depends.append(d.getVarFlag(task, "depends") or "")
+        deptask.append(d.getVarFlag(task, "deptask") or "")
+
+    d.setVarFlag("do_populate_sysroot_post", "depends", " ".join(depends))
+    d.setVarFlag("do_populate_sysroot_post", "deptask", " ".join(deptask))
+
+python () {
+    remove_tasks(["do_patch", "do_unpack", "do_fetch"], d)
+    b = d.getVar("B", True)
+    if not b or b == d.getVar("S", True):
+        merge_tasks(d)
+}
+
+# Manually run do_install & all of its deps
+python do_populate_sysroot_post () {
+    from os.path import exists
+    from bb.build import exec_func, make_stamp
+    from bb import note
+
+    stamp = d.getVar("STAMP", True)
+
+    def rec_exec_task(task, seen):
+        for dep in d.getVarFlag(task, "deps"):
+            if not dep in seen:
+                rec_exec_task(dep, seen)
+        seen.add(task)
+        if not exists("%s.%s" % (stamp, task)):
+            note("%s: executing task %s" % (d.getVar("PF", True), task))
+            exec_func(task, d)
+            flags = d.getVarFlags(task)
+            if not flags.get('nostamp') and not flags.get('selfstamp'):
+                make_stamp(task, d)
+
+    rec_exec_task("do_populate_sysroot", set())
+}
+addtask populate_sysroot_post after do_populate_sysroot
+do_populate_sysroot_post[lockfiles] += "${S}/.lock"