Hi,
I'm having the same issue as well.

Leopard 10.5 and trying to install 0.11.4 Ferret.




Levent Ali wrote:
> Can anyone shed light on why this is happening?
> It happens with ferret 0.11.4 and 0.11.5
> 
> I installed ferret 0.11.3 without any hiccups before the recent release
> of OS X 10.5.1
> 
> Select which gem to install for your platform (i686-darwin8.10.3)
>  1. ferret 0.11.5 (mswin32)
>  2. ferret 0.11.5 (ruby)
>  3. ferret 0.11.4 (ruby)
>  4. ferret 0.11.4 (mswin32)
>  5. Skip this gem
>  6. Cancel installation
>> 2
> Building native extensions.  This could take a while...
> ERROR:  While executing gem ... (Gem::Installer::ExtensionBuildError)
>     ERROR: Failed to build gem native extension.
> 
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