I guess you need something similar to this in
ConfigurationOfGlamour>stable
spec for: #'common' version: '2.1'. spec for: #'pharo1.3.x' version: '2.2'. spec for: #'pharo1.4.x' version: '2.4'. spec for: #'pharo2.x' version: '2.5'. spec for: #'pharo3.x' version: '2.6-snapshot'.