Thank you for taking time and efforts on elaborate an answer. 
But.. ... I don't have that command neither :( 
```
weston                         weston-dnd                     weston-multi-resource          weston-simple-dmabuf-feedback  weston-subsurfaces
weston-calibrator              weston-editor                  weston-presentation-shm        weston-simple-dmabuf-v4l       weston-terminal
weston-clickdot                weston-eventdemo               weston-resizor                 weston-simple-egl              weston-touch-calibrator
weston-cliptest                weston-flower                  weston-scaler                  weston-simple-shm              weston-transformed
weston-confine                 weston-fullscreen              weston-screenshooter           weston-simple-touch            
weston-content_protection      weston-image                   weston-simple-damage           weston-smoke                   
weston-debug                   weston-info                    weston-simple-dmabuf-egl       weston-stacking
```
If I understood correctly launching weston alone will start a x11 session right?