UPDATE: The ImageMagick team says that these two bugs will be fixed in ImageMagick 6.2.9. The beta release, 6.2.9-0, is expected to be available from ftp.imagemagick.org very soon.

ImageMagick 6.2.8-8 has two bugs that show up when installing RMagick. The first bug causes a SEGV in the Image#quantize method when running the quantize-m.rb example program. This problem does not prevent RMagick from being installed correctly. The other bug causes the clip_path.rb example to generate an incorrect image. I suspect that all uses of Image#quantize and Draw#clip_path will encounter problems.

I've reported both bugs to the ImageMagick team. Until they get them fixed, the only alternative is to install an earlier release of ImageMagick. The ImageMagick download site offers a number of choices, such as ImageMagick 6.2.7-8.