Install arrayfire-rb on macos

https://github.com/prasunanand/arrayfire-rb/issues/1

I am struggling to install arrayfire-rb on macos

Arrayfire was installed from here

[](http://arrayfire.com/download/)

I am installing the ruby bindings from here

[](https://github.com/prasunanand/arrayfire-rb)

Everything works up to

`bundle install`

but when I launch

`rake install`

I receive several

```
In file included from ../../../../ext/mri/ruby_arrayfire.cpp:5:
/usr/local/include/af/cuda.h:12:10: error: 'cuda.h' file not found with include; use "quotes"
instead
#include
^~~~~~~~
"cuda.h"
```

Any advice?