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Options are matched case insensitive, and may be abbreviated to uniqueness.

=over 4

=item B<-description> I<text>

Provide a descriptive text for this patch. Multiple B<-description>
options may be supplied.

If no description is provided, the program try to guess one. This is
usually possible if both directories are simple names, e.g.
'C<pkg-1.16>'. If no description can be determined, the program will
ask for one.

=item B<-diff> I<cmd>

If specified, I<cmd> is the command to be used to
generate the differences between the two versions of the files.  If
not specified, this command defaults to "C<diff -c>".