Issue running the demo app

I am getting the following error:

```
[hammackj@taco:~/Documents/opensource/rust-sdl]$ rustc -L$PWD demo/demo.rc
warning: no debug symbols in executable (-arch x86_64)
[hammackj@taco:~/Documents/opensource/rust-sdl]$ ./demo/demo
2013-10-25 23:38:10.990 demo[5196:1003] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Error (1000) creating CGSWindow on line 263'
*** First throw call stack:
(
)
libc++abi.dylib: terminating with uncaught exception of type NSException
Abort trap: 6
[hammackj@taco:~/Documents/opensource/rust-sdl]$
```

I am trying to compile the demo. I am using OSX 10.9 with rust from brew. I am a bit new to rust, so I am not exactly sure what is needed to fix this.

Any tips/thoughts would be great.
Thanks