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Installer ensureRecentMetacello
Last updated at 8:32 am UTC on 20 September 2019
After a download of a pristine Squeak image you need to issue the following command as a prerequisite for many package installations.

 Installer ensureRecentMetacello

It is mentioned under Squeak Help / Extending the System but might not be so obvious to spot. In addition many installation scripts README files mention this.

This command makes sure you get the Metacello tools.

This also gives you the filetree repository type to put on github.
See FileTree repositories on Github

Note: The result of this command loads a tutorial into the help file which is completely out of date.