Using rake 12.0.0
Using concurrent-ruby 1.0.4
Using i18n 0.8.0
Using minitest 5.10.1
Using thread_safe 0.3.5
Using builder 3.2.3
Using erubis 2.7.0
Using mini_portile2 2.1.0
Using rack 2.0.1
Installing nio4r 1.2.1 with native extensions
Using websocket-extensions 0.1.2
Using mime-types 2.99.3
Using arel 7.1.4
Using babel-source 5.8.35
Using execjs 2.7.0
Installing bcrypt 3.1.11 with native extensions
Using bundler 1.14.4
Installing byebug 9.0.6 with native extensions
Using coffee-script-source 1.12.2
Using method_source 0.8.2
Using thor 0.19.4
Installing debug_inspector 0.0.2 with native extensions
Using orm_adapter 0.5.0
Installing unf_ext 0.0.7.2 with native extensions
Installing ffi 1.9.17 with native extensions
Using sass 3.4.23
Using multi_json 1.12.1
Using kaminari-core 1.0.1
Installing kgio 2.11.0 with native extensions
Using rb-fsevent 0.9.8
Using netrc 0.11.0
Installing pg 0.19.0 with native extensions
Installing puma 3.7.0 with native extensions
Installing raindrops 0.17.0 with native extensions
Using tilt 2.0.6
Installing sqlite3 1.3.13 with native extensions
Using turbolinks-source 5.0.0
Using tzinfo 1.2.2
Installing nokogiri 1.7.0.1 with native extensions
Using rack-test 0.6.3
Using warden 1.2.7
Using sprockets 3.7.1
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

/usr/local/rvm/rubies/ruby-2.2.2/bin/ruby -r
./siteconf20170221-1120-1inbebm.rb extconf.rb --with-cflags=-std=c99
checking for unistd.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/rvm/rubies/ruby-2.2.2/bin/$(RUBY_BASE_NAME)
/usr/local/rvm/rubies/ruby-2.2.2/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/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:587:in `try_cpp'
from /usr/local/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:1060:in `block in
have_header'
from /usr/local/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:911:in `block in
checking_for'
from /usr/local/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:351:in `block (2
levels) in postpone'
	from /usr/local/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:321:in `open'
from /usr/local/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:351:in `block in
postpone'
	from /usr/local/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:321:in `open'
	from /usr/local/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:347:in `postpone'
from /usr/local/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:910:in
`checking_for'
from /usr/local/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:1059:in
`have_header'
	from extconf.rb:3:in `<main>'

extconf failed, exit code 1

Gem files will remain installed in
/usr/local/rvm/gems/ruby-2.2.2/gems/nio4r-1.2.1 for inspection.
Results logged to
/usr/local/rvm/gems/ruby-2.2.2/extensions/x86_64-linux/2.2.0/nio4r-1.2.1/gem_make.out

An error occurred while installing nio4r (1.2.1), and Bundler cannot
continue.
Make sure that `gem install nio4r -v '1.2.1'` succeeds before bundling.