I cant build the 3.0 api

I have tried to build the api 3.0 by follow the instructions given on the README.md, I've used the 3.0 branch of cakephp, but it doesn't generate it, though, I've executed 

```
make build-all
```

and it has generated me the 2.0, ..., 2.4, and with

```
make build-3.0
```

I've got an error message saying 

> **make **\* Inexistant rules to make the target << build-3.0 >>. Stop**
