Can't compile on Intel Mac

I ran
```shell
git submodule init
git submodule update
```
and then ran
```shell
make
```

I get the error:
```
ar: lib/libwren.a: No such file or directory
make[1]: *** [lib/libwren.a] Error 1
make: *** [libwren.a] Error 2
```

Sorry if I'm not doing this correctly, I don't have much experience with C