On Tue, May 22, 2007 at 07:46:18AM +0900, Ari Brown wrote: > when I run 'ruby extconf.rb', it says "ruby headers not found". What > does this mean? It means the ruby header files are missing :-) You need to be specific on exactly what platform you're trying to do this on. For example, if you're on Debian or Ubuntu, then you'll need to install the package "ruby1.8-dev" to get these header files.