Francis Vidal wrote: > I have XCode 2.1 installed already. Where do I find the location of > ruby.h if XCode tools is already installed? I do not know how OSX works, so try the *x way; open a console and type in: find / -iname 'ruby.h' It tries to locate the file in any directory under the root. If the file is found, you will see its location. You can then provide this location to extconf. If the file is not found, you must look for some sort of alternative 'development' package (or you could use Fink or DarwinPorts) to get the headers. E -- Posted via http://www.ruby-forum.com/.