--- a/mercurial/util.py	Tue Mar 21 06:50:28 2017 -0700
+++ b/mercurial/util.py	Tue Mar 21 06:50:28 2017 -0700
@@ -136,7 +136,6 @@
 testpid = platform.testpid
 umask = platform.umask
 unlink = platform.unlink
-unlinkpath = platform.unlinkpath
 username = platform.username
 
 # Python compatibility
@@ -1605,6 +1604,19 @@
         else:
             self.close()
 
+def unlinkpath(f, ignoremissing=False):
+    """unlink and remove the directory if it is empty"""
+    try:
+        unlink(f)
+    except OSError as e:
+        if not (ignoremissing and e.errno == errno.ENOENT):
+            raise
+    # try removing directories that might now be empty
+    try:
+        removedirs(os.path.dirname(f))
+    except OSError:
+        pass
+
 def makedirs(name, mode=None, notindexed=False):
     """recursive directory creation with parent mode inheritance