Chris Muller uploaded a new version of System to project The Trunk:
http://source.squeak.org/trunk/System-cmm.755.mcz

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

Name: System-cmm.755
Author: cmm
Time: 20 July 2015, 2:25:20.981 pm
UUID: 874d786b-5d3e-4338-8552-0a22f651fe33
Ancestors: System-cmm.754

Remove references to ObjectHistory, because Spur cannot support it.

=============== Diff against System-cmm.754 ===============

Item was removed:
- ----- Method: Object>>oopAge (in category '*system-support') -----
- oopAge
- 	^ ObjectHistory current ageOf: self!

Item was removed:
- ----- Method: Object>>oopTimestamp (in category '*system-support') -----
- oopTimestamp
- 	^ ObjectHistory current timestampOf: self!