I've just uploaded RMagick 1.7.4. This release fixes a problem that occurs only when compiling with ImageMagick 6.2.1, the most recent release of ImageMagick.
As usual, you can get RMagick at http://rubyforge.org/projects/rmagick/
RMagick is an interface to the ImageMagick (www.imagemagick.org) and GraphicsMagick (www.graphicsmagick.org) image processing libraries. Supports more than 80 image formats, including GIF, JPEG, PNG. Includes 2D drawing API. Comprehensive HTML documentation.