gem install mysql -- --with-mysql-config=/usr/bin/mysql_config
Building native extensions with: '--with-mysql-config=/usr/bin/mysql_config'
This could take a while...
Successfully installed mysql-2.9.1
Parsing documentation for mysql-2.9.1
Done installing documentation for mysql after 2 seconds
1 gem installed
griensu@redmine:~/redmine-2.3-svn-source$ bundle update
Fetching gem metadata from https://rubygems.org/.........
Resolving dependencies...
Using rake 10.1.1
Using i18n 0.7.0 (was 0.6.11)
Using multi_json 1.10.1
Using activesupport 3.2.19
Using builder 3.0.0
Using activemodel 3.2.19
Using erubis 2.7.0
Using journey 1.0.4
Using rack 1.4.5
Using rack-cache 1.2
Using rack-test 0.6.3 (was 0.6.2)
Using hike 1.2.3
Using tilt 1.4.1
Using sprockets 2.2.3 (was 2.2.2)
Using actionpack 3.2.19
Using mime-types 1.25.1
Using polyglot 0.3.5
Using treetop 1.4.15
Using mail 2.5.4
Using actionmailer 3.2.19
Using arel 3.0.3
Using tzinfo 0.3.42 (was 0.3.41)
Using activerecord 3.2.19
Using activeresource 3.2.19
Using bundler 1.7.9
Using mini_portile 0.6.2
Using nokogiri 1.6.5
Using xpath 2.0.0
Using capybara 2.1.0
Using ffi 1.9.6
Using childprocess 0.5.5
Using coderay 1.1.0
Using database_cleaner 1.4.0
Using rack-ssl 1.3.4
Using json 1.8.2 (was 1.8.1)
Using rdoc 3.12.2
Using thor 0.19.1
Using railties 3.2.19
Using jquery-rails 2.0.3
Using metaclass 0.0.4
Using mocha 1.0.0

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    /home/griensu/.rvm/rubies/ruby-2.2.0/bin/ruby -r ./siteconf20150113-4009-wfpqm4.rb extconf.rb --with-mysql-config=/usr/bin/mysql_config
checking for mysql_ssl_set()... yes
checking for rb_str_set_len()... yes
checking for rb_thread_start_timer()... no
checking for mysql.h... yes
*** 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/griensu/.rvm/rubies/ruby-2.2.0/bin/$(RUBY_BASE_NAME)
	--with-mysql-config
extconf.rb:67:in `<main>': uninitialized constant Config (NameError)

extconf failed, exit code 1

Gem files will remain installed in /home/griensu/.rvm/gems/ruby-2.2.0/gems/mysql-2.8.1 for inspection.
Results logged to /home/griensu/.rvm/gems/ruby-2.2.0/extensions/x86_64-linux/2.2.0/mysql-2.8.1/gem_make.out
An error occurred while installing mysql (2.8.1), and Bundler cannot continue.
Make sure that `gem install mysql -v '2.8.1'` succeeds before bundling.