Preamble

It is the equivalent of the control file:

	Summary: Compute the set difference between two arrays.
	Name: set-difference
	Version: 1.0
	Release: 1
	License: GPL
	Group: Applications/Engineering
	Source: http://www.mouraf.org/projects/set_difference/set-difference-1.0.tar.gz
	URL: http://www.mouraf.org/projects/set_difference
	Packager: Pierre-Alexandre Meyer <pam@mouraf.org>

	%description
	Given two arrays of integers a and b, set-difference
	will return the set-difference, which means the set of all
	elements in a that are not in b.
	e.g.:
	  set-difference(1 2 3 4 5,2 3 4 5 6) = {1}
	  set-difference(1 2 3 4 5 6 7 8 9,2 3 4 5 6) = {1 7 8 9}