In <27326947-EB56-48AB-AA0D-4AA49079EDCB / speedymac.com> Lon Baker  wrote:
> Sorry if this is off topic for this list. But has anyone had luck 
> compiling Ruby 1.8.1 or any of the night builds on Mac OS X 10.4 
> "Tiger"?
> 
> The version included with Tiger appears to be broken in that it is 
> missing the zlib extension I believe.

Well be sure and file a bug report before it is released.