only using emacs 24.3 binaries to test for travis.  Checking on drone,
and 24.2 and 24.1 are both failling there with.

```
(wrong-type-argument stringp
			 (lambda
			   (dir)
			   (let
			       ((dirname ...))
			     (or
			      (file-exists-p ...)
			      (file-exists-p ...)))))
```