If Scheme is so good why MIT drops it?

[Terry Reedy]

Roy Smith wrote:
> In article <1cethsrrw8h6k$.9ty7j7u7zovn.dlg at 40tude.net>,
>  Frank Buss <fb at frank-buss.de> wrote:
>  
>> there is one free unique implementation on the 3 major platforms Linux,
>> Windows and MacOS X
> 
> Most people would still consider Solaris to be a "major platform".

?? I do not, but I have no idea what comes in 4th after the other three 
by whatever metric.