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im win7... and i have no idea wat sun os is... but

did you install ruby dev kit?

I am not sure what is dev kit for sun os users, we are done with below steps

bundle install completed with out any errors.

but when we try to install mysql gem running in to problems saying below msg. Please suggest.

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

/usr/local/bin/ruby extconf.rb
checking for mysql_ssl_set()... * 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
--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=/usr/local/bin/ruby
--with-mysql-config
--without-mysql-config
/usr/local/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /usr/local/lib/ruby/1.9.1/mkmf.rb:461:in `try_link0'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:476:in `try_link'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:619:in `try_func'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:894:in `block in have_func'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:790:in `block in checking_for'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:284:in `block (2 levels) in postpone'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:284:in `block in postpone'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:280:in `postpone'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:789:in `checking_for'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:893:in `have_func'
from extconf.rb:45:in `<main>'

Gem files will remain installed in /usr/local/lib/ruby/gems/1.9.1/gems/mysql-2.9.1 for inspection.
Results logged to /usr/local/lib/ruby/gems/1.9.1/gems/mysql-2.9.1/ext/mysql_api/gem_make.out

Check the mkmf.log file for more details.

I had some errors with MySql installation but they were mainly related to file / folder permissions.
Also see what /etc/my.cnf file is having.

just try to use:

gem install mysql2 -- --with-mysql-dir=C:\xampp\mysql