Ruby mysql2 コネクタのインストール失敗対策

Windows7 の環境で MySQL接続ライブラリ mysql2 をインストールしようとすると extconf.rb の実行中にインストールが失敗してしまう。
必要となる引数が足りないことが示される。

問題

gem install mysql2での mysql2 ライブラリのインストール失敗

事象

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

>gem install mysql2
Fetching: mysql2-0.3.17.gem (100%)
Temporarily enhancing PATH to include DevKit...
Building native extensions.  This could take a while...
ERROR:  Error installing mysql2:
        ERROR: Failed to build gem native extension.

    C:/Ruby200/bin/ruby.exe 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()... yes
checking for rb_wait_for_single_fd()... yes
checking for rb_hash_dup()... yes
checking for rb_intern3()... yes
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lm... yes
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lz... no
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lsocket... no
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lnsl... no
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lmygcc... no
checking for mysql_query() in -lmysqlclient... no
*** 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=C:/Ruby200/bin/ruby
        --with-mysql-dir
        --without-mysql-dir
        --with-mysql-include
        --without-mysql-include=${mysql-dir}/include
        --with-mysql-lib
        --without-mysql-lib=${mysql-dir}/
        --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}/
        --with-mysqlclientlib
        --without-mysqlclientlib
        --with-mlib
        --without-mlib
        --with-mysqlclientlib
        --without-mysqlclientlib
        --with-zlib
        --without-zlib
        --with-mysqlclientlib
        --without-mysqlclientlib
        --with-socketlib
        --without-socketlib
        --with-mysqlclientlib
        --without-mysqlclientlib
        --with-nsllib
        --without-nsllib
        --with-mysqlclientlib
        --without-mysqlclientlib
        --with-mygcclib
        --without-mygcclib
        --with-mysqlclientlib
        --without-mysqlclientlib


Gem files will remain installed in C:/Ruby200/lib/ruby/gems/2.0.0/gems/mysql2-0.3.17 for inspection.
Results logged to C:/Ruby200/lib/ruby/gems/2.0.0/gems/mysql2-0.3.17/ext/mysql2/gem_make.out

対策

mysql-connectorをダウンロードの上展開しておき、そのフォルダを –with-mysql-dir で指定する。

>gem install mysql2 — ‘–with-mysql-dir=”c:\Users\daisuke\Downloads\mysql-connector-c-6.1.5-win32″‘

>gem install mysql2 -- '--with-mysql-dir="c:\Users\daisuke\Downloads\mysql-connector-c-6.1.5-win32"'
Temporarily enhancing PATH to include DevKit...
Building native extensions with: '--with-mysql-dir="c:\Users\daisuke\Downloads\mysql-connector-c-6.1.5-win32"'
This could take a while...
Successfully installed mysql2-0.3.17
Parsing documentation for mysql2-0.3.17
unable to convert "\x90" from ASCII-8BIT to UTF-8 for lib/mysql2/mysql2.so, skipping
Installing ri documentation for mysql2-0.3.17
1 gem installed
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