Because the importers have many of their own dependencies, they are made
available via a separate gem called
jekyll-import. To use them, all
you need to do is install the gem, and they will become available as part of
Jekyll’s standard command line interface.
Jekyll-import requires you to manually install some dependencies.
Most importers require one or more dependencies. In order to keep
jekyll-import's footprint small, we don't bundle the gem
with every plausible dependency. Instead, you will see a nice error
message describing any missing dependency and how to install it. If
you're especially savvy, take a look at the
method in your chosen importer to install all of the deps in one go.