A new version of System was added to project The Inbox:
http://source.squeak.org/inbox/System-jr.928.mcz

==================== Summary ====================

Name: System-jr.928
Author: jr
Time: 28 February 2017, 1:52:26.276081 am
UUID: 3b79a197-c860-eb40-8f04-645f64bc7988
Ancestors: System-jr.927

return an environment dependent systemNavigation

mainly to be used by tools that override #environment

=============== Diff against System-jr.927 ===============

Item was changed:
  ----- Method: Object>>systemNavigation (in category '*system-support') -----
  systemNavigation
  
+ 	^ SystemNavigation for: self environment!
- 	^ SystemNavigation default!