AMS> That is what it says, though not in so many words. Having an option AMS> for each VS would really be a headache (SCCS, RCS, CVS, hg, darcs, AMS> bzr, tla, git, ...).
Well all I know is we then harangue the system administrator for not installing the latest diff that the other guys are already using... when in fact they are not using diff at all and diff --git would fail on their machine too because they have boldly invented a fantasy unlike any other seen there on the command line... So maybe there should be a general disclaimer added about some people spreading false rumors about diff options...