Make linux fails

I am using an older version (about a month old)  of mapbox-gl-native where the installation process went fine. Now I wanted to update to a newer version.
But I am not able to make the linux build anymore. After cloning the repo and the "make setup" step I tried to run the make linux step on three different machines but the error message I get is always the same:

```
In file included from ../../src/util/threadpool.cpp:1:0:
../../include/mbgl/util/threadpool.hpp:39:13: error: ‘unique_ptr’ in namespace ‘std’ does not name a template type
 extern std::unique_ptr<Threadpool> threadpool;
             ^
../../src/util/threadpool.cpp:8:41: error: ‘mbgl::util::threadpool’ should have been declared inside ‘mbgl::util’
 std::unique_ptr<Threadpool> mbgl::util::threadpool = std::make_unique<Threadpool>(std::thread::hardware_concurrency());
                                         ^
make[1]: *** [../Release/obj.target/mapboxgl/src/util/threadpool.o] Fehler 1
make[1]: Verlasse Verzeichnis '/home/eduard/mbgl/mapbox-gl-native/build/linux'
make: *** [linux] Fehler 2
```

I also tried to reinstall the dependecies. The Mapbox-Token should also be fine. Any ideas what might go wrong?