ruby - jekyll を Docker イメージにインストールするには?

Question

コマンドを使用できる docker イメージを生成したいと思いjekyllます。

Dockerfile次の内容のを生成しました。

# https://hub.docker.com/_/ruby/
FROM ruby:slim

RUN gem install jekyll

残念ながらエラーがスローされます：

ERROR:  Error installing jekyll:
    ERROR: Failed to build gem native extension.

    current directory: /usr/local/bundle/gems/ffi-1.9.10/ext/ffi_c
/usr/local/bin/ruby -r ./siteconf20160615-7-12pthrg.rb extconf.rb
checking for ffi.h... *** 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=/usr/local/bin/$(RUBY_BASE_NAME)
    --with-ffi_c-dir
    --without-ffi_c-dir
    --with-ffi_c-include
    --without-ffi_c-include=${ffi_c-dir}/include
    --with-ffi_c-lib
    --without-ffi_c-lib=${ffi_c-dir}/lib
    --with-libffi-config
    --without-libffi-config
    --with-pkg-config
    --without-pkg-config
/usr/local/lib/ruby/2.3.0/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
    from /usr/local/lib/ruby/2.3.0/mkmf.rb:587:in `try_cpp'
    from /usr/local/lib/ruby/2.3.0/mkmf.rb:1091:in `block in have_header'
    from /usr/local/lib/ruby/2.3.0/mkmf.rb:942:in `block in checking_for'
    from /usr/local/lib/ruby/2.3.0/mkmf.rb:350:in `block (2 levels) in postpone'
    from /usr/local/lib/ruby/2.3.0/mkmf.rb:320:in `open'
    from /usr/local/lib/ruby/2.3.0/mkmf.rb:350:in `block in postpone'
    from /usr/local/lib/ruby/2.3.0/mkmf.rb:320:in `open'
    from /usr/local/lib/ruby/2.3.0/mkmf.rb:346:in `postpone'
    from /usr/local/lib/ruby/2.3.0/mkmf.rb:941:in `checking_for'
    from /usr/local/lib/ruby/2.3.0/mkmf.rb:1090:in `have_header'
    from extconf.rb:16:in `<main>'

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

  /usr/local/bundle/extensions/x86_64-linux/2.3.0-static/ffi-1.9.10/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /usr/local/bundle/gems/ffi-1.9.10 for inspection.
Results logged to /usr/local/bundle/extensions/x86_64-linux/2.3.0-static/ffi-1.9.10/gem_make.out

私は何を間違っていますか？