Frank Shearar uploaded a new version of Environments to project The Trunk:
http://source.squeak.org/trunk/Environments-fbs.13.mcz

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

Name: Environments-fbs.13
Author: fbs
Time: 12 February 2013, 2:45:37.443 pm
UUID: c649c1f4-2903-4683-b619-d35141bb259b
Ancestors: Environments-bf.12

Max Leske's fix to Environments to support Fuel (hence the methods being in the compatibility category).

=============== Diff against Environments-bf.12 ===============

Item was added:
+ ----- Method: Environment>>keyAtValue: (in category 'compatibility') -----
+ keyAtValue: anObject
+ 	^ self keyAtIdentityValue: anObject!

Item was added:
+ ----- Method: Environment>>removeKey:ifAbsent: (in category 'compatibility') -----
+ removeKey: key ifAbsent: aBlock
+ 	contents
+ 		removeKey: key
+ 		ifAbsent: aBlock!