gem install jekyll 遇到 ffi.h 错误, 求 解决方法。。。

root@64f63ff50c38:/# gem install jekyll
Fetching: liquid-3.0.6.gem (100%)
Successfully installed liquid-3.0.6
Fetching: kramdown-1.9.0.gem (100%)
Successfully installed kramdown-1.9.0
Fetching: mercenary-0.3.5.gem (100%)
Successfully installed mercenary-0.3.5
Fetching: safe_yaml-1.0.4.gem (100%)
Successfully installed safe_yaml-1.0.4
Fetching: colorator-0.1.gem (100%)
Successfully installed colorator-0.1
Fetching: rouge-1.10.1.gem (100%)
Successfully installed rouge-1.10.1
Fetching: sass-3.4.19.gem (100%)
Successfully installed sass-3.4.19
Fetching: jekyll-sass-converter-1.3.0.gem (100%)
Successfully installed jekyll-sass-converter-1.3.0
Fetching: rb-fsevent-0.9.6.gem (100%)
Successfully installed rb-fsevent-0.9.6
Fetching: ffi-1.9.10.gem (100%)
Building native extensions.  This could take a while...
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 ./siteconf20151111-5-1ydpmrp.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/2.2.0/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/2.2.0/mkmf.rb:587:in `try_cpp'
        from /usr/local/lib/ruby/2.2.0/mkmf.rb:1060:in `block in have_header'
        from /usr/local/lib/ruby/2.2.0/mkmf.rb:911:in `block in checking_for'
        from /usr/local/lib/ruby/2.2.0/mkmf.rb:351:in `block (2 levels) in postpone'
        from /usr/local/lib/ruby/2.2.0/mkmf.rb:321:in `open'
        from /usr/local/lib/ruby/2.2.0/mkmf.rb:351:in `block in postpone'
        from /usr/local/lib/ruby/2.2.0/mkmf.rb:321:in `open'
        from /usr/local/lib/ruby/2.2.0/mkmf.rb:347:in `postpone'
        from /usr/local/lib/ruby/2.2.0/mkmf.rb:910:in `checking_for'
        from /usr/local/lib/ruby/2.2.0/mkmf.rb:1059: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/2.2.0-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/2.2.0-static/ffi-1.9.10/gem_make.out

root@64f63ff50c38:/# apt-get install libffi-dev
Reading package lists... Done
Building dependency tree       
Reading state information... Done
libffi-dev is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 5 not upgraded.