mysql install

    current directory: /Users/bparanj/.rvm/gems/ruby-2.4.0@r51/gems/mysql2-0.4.6/ext/mysql2
/Users/bparanj/.rvm/rubies/ruby-2.4.0/bin/ruby -r ./siteconf20170510-4006-hvrm81.rb extconf.rb
checking for rb_absint_size()... yes
checking for rb_absint_singlebit_p()... yes
checking for ruby/thread.h... yes
checking for rb_thread_call_without_gvl() in ruby/thread.h... yes
checking for rb_thread_blocking_region()... no
checking for rb_wait_for_single_fd()... yes
checking for rb_hash_dup()... yes
checking for rb_intern3()... yes
checking for rb_big_cmp()... yes
checking for mysql_query() in -lmysqlclient... no
-----
mysql client is missing. You may need to 'brew install mysql' or 'port install mysql', and try again.
-----
*** 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
--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=/Users/bparanj/.rvm/rubies/ruby-2.4.0/bin/$(RUBY_BASE_NAME)
--with-mysql-dir
--without-mysql-dir
--with-mysql-include
--without-mysql-include=${mysql-dir}/include
--with-mysql-lib
--without-mysql-lib=${mysql-dir}/lib
--with-mysql-config
--without-mysql-config
--with-mysql-dir
--without-mysql-dir
--with-mysql-include
--without-mysql-include=${mysql-dir}/include
--with-mysql-lib
--without-mysql-lib=${mysql-dir}/lib
--with-mysqlclientlib
--without-mysqlclientlib

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

  /Users/bparanj/.rvm/gems/ruby-2.4.0@r51/extensions/x86_64-darwin-14/2.4.0/mysql2-0.4.6/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /Users/bparanj/.rvm/gems/ruby-2.4.0@r51/gems/mysql2-0.4.6 for inspection.
Results logged to /Users/bparanj/.rvm/gems/ruby-2.4.0@r51/extensions/x86_64-darwin-14/2.4.0/mysql2-0.4.6/gem_make.out

An error occurred while installing mysql2 (0.4.6), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.4.6'` succeeds before bundling.

To connect run:
    mysql -uroot

To have launchd start mysql now and restart at login:
  brew services start mysql
Or, if you don't want/need a background service you can just run:
  mysql.server start