LatexMorph: missing ExternalUnixOSProcess

>
> LatexUnix, on its class side, has the following:
>
> LatexUnix Class >> isResponsibleForThisPlatform
> ^ ExternalUnixOSProcess isResponsibleForThisPlatform
>
> ExternalUnixOSProcess is not present on my system (using OSX).
>
> Any hints on how to find this class?
> Thanks!
>
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