When I try to `make` the vte package I get this error:

```
app.vala:23.23-23.33: error: The type name `Gtk.Popover' could not be found
class SearchPopover : Gtk.Popover
                      ^^^^^^^^^^^
Compilation failed: 1 error(s), 0 warning(s)
make[3]: *** [vte_2_91_vala.stamp] Error 1
make[3]: Leaving directory `/home/marcel/vte-ng/src'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/home/marcel/vte-ng/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/marcel/vte-ng'
make: *** [all] Error 2
```

I am on bash on ubuntu on windows or whatever it's called.