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Re: (ITS#3969) SunOS' diff doesn't like -u
>> Most commercial Unix systems do not support it; it was only commonly
>> established in the last versions of GNU diff. The only sure thing
>> will be to use -c.
> Some diff(1) implementations don't support -c.
As far as I can tell, diff is only used to show the user differences
from a failed test. (test001-slapadd, test011-glue-slapadd.) So it
should be OK to use whatever option is available: Let a configure test
pick -u if that works, otherwise -c if that works, otherwise nothing.