I also discovered that there is also a dependency upon the message 
eating Null package available at:

http://www.squeaksource.com/Null

Keith Hodges wrote:
> Andreas Raab wrote:
>> Hi Keith -
>>
>> > rio is available from http://www.squeaksource.com/Rio
> I deleted the older "Rio" packages to avoid confusion.
> Load order is
>
> Rio-Kernel
> Rio-Core
> Rio-Tests
>
> Keith


	
	
		
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