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mysql2がインストールできない問題

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Railsでmysql2をインストールできなかったので、解決策を書いていきます。
結論から述べるとosをsierraにアップグレードしたことによってエラーが出たっぽいです。検索してるうちに他の方の似たようなエラーがいくつかありました。

バージョン mac osx sierra 10.12.1
$ rails -v
4.2.4
Gemfile
gem 'mysql2', '~> 0.3.20'

$ bundle install
#=>よくあるエラー
An error occurred while installing mysql2 (0.3.20), and
Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.3.20'` succeeds before
bundling.

ログに書かれている通りにコマンド実行

$ gem install mysql2 -v '0.3.20'

Building native extensions.  This could take a while...
ERROR:  Error installing mysql2:
    ERROR: Failed to build gem native extension.

    /Users/****/.rbenv/versions/2.2.0/bin/ruby -r ./siteconf20161102-11170-******.rb extconf.rb
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
-----
Using mysql_config at /usr/local/bin/mysql_config
-----
checking for mysql.h... yes
checking for errmsg.h... yes
checking for mysqld_error.h... yes
-----
Don't know how to set rpath on your system, if MySQL libraries are not in path mysql2 may not load
-----
-----
Setting libpath to /usr/local/Cellar/mysql/5.7.14/lib
-----
creating Makefile

make "DESTDIR=" clean

make "DESTDIR="
compiling client.c
compiling infile.c
compiling mysql2_ext.c
compiling result.c
linking shared-object mysql2/mysql2.bundle
ld: library not found for -lssl
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [mysql2.bundle] Error 1

make failed, exit code 2

Gem files will remain installed in /Users/*****/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/mysql2-0.3.20 for inspection.
Results logged to /Users/******/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/extensions/x86_64-darwin-15/2.2.0-static/mysql2-0.3.20/gem_make.out

xcodeをアップデートすると良いらしいです
以下のコマンドの後。インストールできました。

$ xcode-select --install
$ sudo gem install mysql2 -v '0.3.20'
Password:
Building native extensions.  This could take a while...
Successfully installed mysql2-0.3.20
Parsing documentation for mysql2-0.3.20
Installing ri documentation for mysql2-0.3.20
Done installing documentation for mysql2 after 2 seconds
1 gem installed

bundle installもうまくいきました。

参考にさせていただきました。
http://qiita.com/akito19/items/e1dc54f907987e688cc0

nakki
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