am b392641d: Make  fail if it\'s called after including 

Merge commit 'b392641d9b07d6321aed828c983af04115da8aab' into eclair-plus-aosp

* commit 'b392641d9b07d6321aed828c983af04115da8aab':
  Make $(my-dir) fail if it's called after including $(CLEAR_VARS)