[Rails] Re: Unable to install mysql2 gem on windows 7

On Mar 20, 10:50 am, lohith MV <lohithmv...@gmail.com> wrote:
> I am getting the following error message while installing, let me know
> if any one needs some more details. I followed instruction from
> "https://github.com/oneclick/rubyinstaller/wiki/Development-Kit".
>
> I am using ruby 1.9.2p136 (2010-12-25) [i386-mingw32].
>
> E:\work_desk\trunk>gem install mysql2 -v 0.2.4
> 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:/Ruby192/bin/ruby.exe extconf.rb
> checking for rb_thread_blocking_region()... yes
> checking for main() in -llibmysql... 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:/Ruby192/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-libmysqllib
>         --without-libmysqllib
>
> Gem files will remain installed in C:/Ruby192/lib/ruby/gems/1.9.1/gems/
> mysql2-0.
> 2.4 for inspection.
> Results logged to C:/Ruby192/lib/ruby/gems/1.9.1/gems/mysql2-0.2.4/ext/
> mysql2/ge
> m_make.out

You have to include path to mysql header and library files:

gem install mysql2 -- --with-mysql-include=c:/path/to/mysql/include --
with-mysql-lib=c:/path/to/mysql/lib

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