Here is the preference for doing just that:
http://www.smalltalkhub.com/#!/~philippeback/HOExtras/packages/Settings-Metacello
In fact, I noticed there was no Settings-Metacello and I created one, along
with that single pref in it. Maybe will be useful for future things
The metacelloPlatformAttributes has been changed like this and put in a
*settings-metacello protocol instead of being in "miscellaneous".
metacelloPlatformAttributes
"Returns the tags for the conditional platform loading in Metacello.
Pay attention the order is important: from most to least general."
"For release integrators, we should not have #'pharo1.3x' **and**
#'pharo1.4.x'"
^ SmalltalkImage Pharo2Compatible ifTrue: [
#(#squeakCommon #pharo #'pharo2.x' #'pharo2.0.x')
] ifFalse: [
#(#squeakCommon #pharo #'pharo3.x' #'pharo3.0.x')
]
.
Feel free to integrate :-)
Phil