Running thyme without display

I'm trying to run thyme in Ubuntu terminal:

```
$ ./thyme-linux-386 track -o thyme.out
xdpyinfo failed with error: exit status 1. Try running `xdpyinfo | grep dimensions` to diagnose.
2018/09/20 14:36:45 xdpyinfo failed with error: exit status 1. Try running `xdpyinfo | grep dimensions` to diagnose.

```
```

$ xdpyinfo | grep dimensions
xdpyinfo:  unable to open display "".

```