diff --git a/bitbake/lib/bb/parse/ast.py b/bitbake/lib/bb/parse/ast.py
index d30b688965..7581d003fd 100644
--- a/bitbake/lib/bb/parse/ast.py
+++ b/bitbake/lib/bb/parse/ast.py
@@ -314,6 +314,16 @@ class InheritNode(AstNode):
     def eval(self, data):
         bb.parse.BBHandler.inherit(self.classes, self.filename, self.lineno, data)
 
+class InheritDeferredNode(AstNode):
+    def __init__(self, filename, lineno, classes):
+        AstNode.__init__(self, filename, lineno)
+        self.inherit = (classes, filename, lineno)
+
+    def eval(self, data):
+        inherits = data.getVar('__BBDEFINHERITS', False) or []
+        inherits.append(self.inherit)
+        data.setVar('__BBDEFINHERITS', inherits)
+
 def handleInclude(statements, filename, lineno, m, force):
     statements.append(IncludeNode(filename, lineno, m.group(1), force))
 
@@ -364,6 +374,10 @@ def handleInherit(statements, filename, lineno, m):
     classes = m.group(1)
     statements.append(InheritNode(filename, lineno, classes))
 
+def handleInheritDeferred(statements, filename, lineno, m):
+    classes = m.group(1)
+    statements.append(InheritDeferredNode(filename, lineno, classes))
+
 def runAnonFuncs(d):
     code = []
     for funcname in d.getVar("__BBANONFUNCS", False) or []:
@@ -430,6 +444,14 @@ def multi_finalize(fn, d):
         logger.debug("Appending .bbappend file %s to %s", append, fn)
         bb.parse.BBHandler.handle(append, d, True)
 
+    while True:
+        inherits = d.getVar('__BBDEFINHERITS', False) or []
+        if not inherits:
+            break
+        inherit, filename, lineno = inherits.pop(0)
+        d.setVar('__BBDEFINHERITS', inherits)
+        bb.parse.BBHandler.inherit(inherit, filename, lineno, d, deferred=True)
+
     onlyfinalise = d.getVar("__ONLYFINALISE", False)
 
     safe_d = d
diff --git a/bitbake/lib/bb/parse/parse_py/BBHandler.py b/bitbake/lib/bb/parse/parse_py/BBHandler.py
index 4d5b45e1ef..cd1c998f8f 100644
--- a/bitbake/lib/bb/parse/parse_py/BBHandler.py
+++ b/bitbake/lib/bb/parse/parse_py/BBHandler.py
@@ -21,6 +21,7 @@ from .ConfHandler import include, init
 
 __func_start_regexp__    = re.compile(r"(((?P<py>python(?=(\s|\()))|(?P<fr>fakeroot(?=\s)))\s*)*(?P<func>[\w\.\-\+\{\}\$:]+)?\s*\(\s*\)\s*{$" )
 __inherit_regexp__       = re.compile(r"inherit\s+(.+)" )
+__inherit_def_regexp__   = re.compile(r"inherit_defer\s+(.+)" )
 __export_func_regexp__   = re.compile(r"EXPORT_FUNCTIONS\s+(.+)" )
 __addtask_regexp__       = re.compile(r"addtask\s+(?P<func>\w+)\s*((before\s*(?P<before>((.*(?=after))|(.*))))|(after\s*(?P<after>((.*(?=before))|(.*)))))*")
 __deltask_regexp__       = re.compile(r"deltask\s+(.+)")
@@ -40,8 +41,10 @@ def supports(fn, d):
     """Return True if fn has a supported extension"""
     return os.path.splitext(fn)[-1] in [".bb", ".bbclass", ".inc"]
 
-def inherit(files, fn, lineno, d):
+def inherit(files, fn, lineno, d, deferred=False):
     __inherit_cache = d.getVar('__inherit_cache', False) or []
+    #if "${" in files and not deferred:
+    #    bb.warn("%s:%s has non deferred conditional inherit" % (fn, lineno))
     files = d.expand(files).split()
     for file in files:
         classtype = d.getVar("__bbclasstype", False)
@@ -265,6 +268,11 @@ def feeder(lineno, s, fn, root, statements, eof=False):
         ast.handleInherit(statements, fn, lineno, m)
         return
 
+    m = __inherit_def_regexp__.match(s)
+    if m:
+        ast.handleInheritDeferred(statements, fn, lineno, m)
+        return
+
     return ConfHandler.feeder(lineno, s, fn, statements, conffile=False)
 
 # Add us to the handlers list