when I run gem install rmagick-2.13.1.gem from the directory in which rmagick-2.13.1.gem is I get an Error saying that it failed to build gem native extension, belo
use rmagick2 for
Ruby 1.8.2 and later, including Ruby 1.9
ImageMagick 6.3.0-7 or later
RMagick 2 is the future of RMagick. This is the version that will get new methods and support new ImageMagick features.