【Ubuntu】Mastodon構築時にbundle中にidn-rubyでエラー

$ bundle install --deployment --without development test

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /home/mastodon/live/vendor/bundle/ruby/2.5.0/gems/idn-ruby-0.1.0/ext
/home/mastodon/.rbenv/versions/2.5.1/bin/ruby -r ./siteconf20180604-4696-1svl43p.rb extconf.rb
checking for -lidn... no
ERROR: could not find idn library!

  Please install the GNU IDN library or alternatively specify at least one
  of the following options if the library can only be found in a non-standard
  location:
    --with-idn-dir=/path/to/non/standard/location
        or
    --with-idn-lib=/path/to/non/standard/location/lib
    --with-idn-include=/path/to/non/standard/location/include

*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
    --with-opt-dir
    --without-opt-dir
    --with-opt-include
    --without-opt-include=${opt-dir}/include
    --with-opt-lib
    --without-opt-lib=${opt-dir}/lib
    --with-make-prog
    --without-make-prog
    --srcdir=.
    --curdir
    --ruby=/home/mastodon/.rbenv/versions/2.5.1/bin/$(RUBY_BASE_NAME)
    --with-idn-dir
    --without-idn-dir
    --with-idn-include
    --without-idn-include=${idn-dir}/include
    --with-idn-lib
    --without-idn-lib=${idn-dir}/lib
    --with-idnlib
    --without-idnlib

To see why this extension failed to compile, please check the mkmf.log which can be found here:

  /home/mastodon/live/vendor/bundle/ruby/2.5.0/extensions/x86_64-linux/2.5.0-static/idn-ruby-0.1.0/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /home/mastodon/live/vendor/bundle/ruby/2.5.0/gems/idn-ruby-0.1.0 for inspection.
Results logged to /home/mastodon/live/vendor/bundle/ruby/2.5.0/extensions/x86_64-linux/2.5.0-static/idn-ruby-0.1.0/gem_make.out

An error occurred while installing idn-ruby (0.1.0), and Bundler cannot continue.
Make sure that `gem install idn-ruby -v '0.1.0' --source 'https://rubygems.org/'` succeeds before bundling.

In Gemfile:
  idn-ruby