gem not working on github.io

[riccardoklinger]

I was adding the gem to my github.io page. There is a build error with this gem:
The tag leaflet_map on line 19 in index.html is not a recognized Liquid tag
I do have:

group :jekyll_plugins do
  gem 'jekyll-paginate'
  gem 'jekyll-sitemap'
  gem 'jekyll-leaflet'
end

in my GemFile

and:

plugins:
  - jekyll-paginate
  - jekyll-sitemap
  - jekyll-leaflet

in my _config.yml

[DavidJVitale]

I do not believe GitHub pages supports third party gems/plugins (like Jekyll-leaflet). So I’m not sure you can use it with GitHub pages, unless you build yourself and push up manually. I’m not too familiar with GitHub pages so maybe someone else can chime in