I have the Ruby version ruby 1.9.2p0 (2010-08-18) [i386-mingw32] installed in Windows7. and the gem vesion 1.3.7
When i tried to install mysql gem, it is showing
key: the line that says You have to install development tools first. ref: devkit
use
gem install mysql
for windows, till mysql2 get it right.
You can try
gem install mysql2 -v '0.0.00' -- --with-ldflags=-L/usr/local/opt/openssl/lib --with-cppflags=-I/usr/local/opt/openssl/include