How do I enable the "feature" packaging type?

I am a complete newbie trying to build a new binding. I have run the script. But I fail at the first build.

[INFO] Scanning for projects...
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[ERROR] Unknown packaging: feature @ line 12, column 14
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]   The project org.openhab.addons.features.karaf:org.openhab.addons.features.karaf.openhab-addons:2.5.3-SNAPSHOT (/home/roger/openhab-addons/features/openhab-addons/pom.xml) has 1 error
[ERROR]     Unknown packaging: feature @ line 12, column 14
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1]

I would expect a clean build to actually work at this point.

It appears whatever provides the “feature” packaging type has not been installed/activated. How do I fix this? All help gratefully received.

The learning curve on this project is steep enough, without having to fix problems on what should be clean builds.