You can specify alternative branches and forks, respectively:
{ meteor: { "branch": "devel", "git": "https://github.com/meteor/meteor.git" } }
In the documentation:
A meteor specification is not required. By default, the Meteor repeater is publicly checked for the master branch. You can specify meteor.branch and meteor.git to use alternate branches and forks, respectively.
To use the stable version, simply omit the meteor section from the smart.json file as a whole, and you will use the latest stable version.
Timdog
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