Many others have done this, so thanks to those who provided the info used here.

Gem Installation

When setting up gems unset the environment variable RUBYOPT RUBYOPT=""

Rails Installation

Don’t need --include-dependencies switch any more, they’re installed by default.

MySQL

In Cygwin you’ll want to install the MySQL gem. This needs the MySql libraries/source in order to build, so you need to download the source. Then run

./configure make install

This failed at first, trying to resolve by

• installing g++ using cygwin setup

Now you have what you need to install the MySql gem. gem install mysql

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