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Normally, the sccs driver program locates the other tools by
searching the directories specified in PATH, but if it is
running set-user-id or set-group-id, a compiled-in value is used
instead. By default, this value is is `/usr/sccs'.
If SCCS is not privileged, it will fall back on the compiled-in
value in order to find the other tools if they are not found in any of
the directories in $PATH.
In normal operation, sccs diffs will use the system diff
command by searching the PATH environment variable. This doesn't
happen if it is running set-user-id or set-group-id.