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てしりこじり

しりがちいさいエンジニアがいるという

gem install mysql2 でエラー

mysql2 が含まれている Gemfile を使って bundle install してるときにエラーが出ました。

$ bundle install --path vendor/bundle --without development test

Gem files will remain installed in /home/hoge/fuga/vendor/bundle/ruby/2.1.0/gems/mysql2-0.3.15 for inspection.
Results logged to /home/hoge/fuga/vendor/bundle/ruby/2.1.0/extensions/x86_64-linux/2.1.0-static/mysql2-0.3.15/gem_make.out
An error occurred while installing mysql2 (0.3.15), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.3.15'` succeeds before bundling.

言われるがままに mysql2 を突っ込んでみたがエラー

$ gem install mysql2 -v '0.3.15'
Building native extensions.  This could take a while...
ERROR:  Error installing mysql2:
        ERROR: Failed to build gem native extension.

    /home/hoge/.rbenv/versions/2.1.1/bin/ruby 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... yes
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... yes
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=/home/hoge/.rbenv/versions/2.1.1/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}/lib
        --with-mysql-config
        --without-mysql-config
        --with-mysql-dir
        --without-mysql-dir
        --with-mysql-include
        --without-mysql-include=${mysql-dir}/include
        --with-mysql-lib
        --with-mysql-lib
        --without-mysql-lib=${mysql-dir}/lib
        --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

extconf failed, exit code 1

Gem files will remain installed in /home/hoge/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/mysql2-0.3.15 for inspection.
Results logged to /home/hoge/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/extensions/x86_64-linux/2.1.0-static/mysql2-0.3.15/gem_make.out

そもそも mysql.h がないらしい。

$ sudo apt-get install libmysqld-dev

ライブラリをインストールしてあげた後、再度試したら成功。