---------------------------------------------------------------- C:\rails\rcms-0.3.1>gem install -v=1.15.0 rmagick Bulk updating Gem source index for: http://gems.rubyforge.org Building native extensions. This could take a while... ERROR: While executing gem ... (Gem::Installer::ExtensionBuildError) ERROR: Failed to build gem native extension.
ruby gem_extconf.rb install -v=1.15.0 rmagick
sh configure
It's trying to install RMagick 1.15.0 which is not available for Windows.
Try 1.14.1 for Windows downloaded from here (once you unzip it read README):