I have the same error with this package

*************
FROM fedora:latest
RUN dnf -y update
RUN dnf -y install @development-tools ruby{,-devel,gems,gem-json} wget redhat-rpm-config zlib-devel libxml2-devel libxslt-devel
RUN wget -O /tmp/test.rb https://gist.githubusercontent.com/anonymous/5ddaa37e8ebcae88dd5e2f056b6b0d49/raw/1c253633ab0ce5411308368aa4ddd00b725e18fa/-
RUN gem install nokogiri -- --use-system-libraries
RUN gem update --system
RUN gem update
RUN gem install bundler
RUN ruby /tmp/test.rb

2016-07-05 12:40 GMT+02:00 Dominic Cleal <dominic@cleal.org>:
On 05/07/16 11:28, Marwan Rabbâa wrote:
> Hello,
>
> Few days ago, the last version of Rails was out.
>
> I can see, with the following Dockerfile, that json support was dropped
>
> ************************************************************************
> FROM fedora:latest
> RUN dnf -y update
> RUN dnf -y install @development-tools ruby{,-devel,gems} wget
> redhat-rpm-config zlib-devel libxml2-devel libxslt-devel

Also install the rubygem-json package.

--
Dominic Cleal
dominic@cleal.org
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