Diff ViSP-3.0.1-r1 with a ViSP-3.1.0-r1

/usr/portage/sci-libs/ViSP/ViSP-3.1.0-r1.ebuild 2018-09-21 23:09:00.000000000 +0300
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SRC_URI="http://gforge.inria.fr/frs/download.php/latestfile/475/visp-${PV}.tar.gz"
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LICENSE="GPL-2"
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SLOT="0/3"
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SLOT="0/3.1"
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KEYWORDS="~amd64 ~arm"
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IUSE="
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	+coin demos +dmtx doc examples ffmpeg gsl ieee1394 jpeg lapack motif ogre
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	+coin demos +dmtx doc examples gsl ieee1394 jpeg lapack motif ogre
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	opencv png test tutorials usb v4l X xml +zbar zlib
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	cpu_flags_x86_sse2 cpu_flags_x86_sse3 cpu_flags_x86_ssse3
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"
......
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RDEPEND="
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	coin? ( media-libs/coin virtual/opengl )
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	dmtx? ( media-libs/libdmtx )
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	ffmpeg? ( virtual/ffmpeg )
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	gsl? ( sci-libs/gsl )
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	ieee1394? ( media-libs/libdc1394 )
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	jpeg? ( virtual/jpeg:0 )
......
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	v4l? ( virtual/os-headers )"
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RDEPEND="${RDEPEND}
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	demos? ( sci-misc/ViSP-images )"
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REQUIRED_USE="
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	ffmpeg? ( opencv )
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	motif? ( coin )
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"
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REQUIRED_USE="motif? ( coin )"
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S="${WORKDIR}/visp-${PV}"
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PATCHES=( "${FILESDIR}/${PN}-3.0.1-opencv.patch" "${FILESDIR}/${PN}-3.0.0-ffmpeg3.patch" )
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PATCHES=( "${FILESDIR}/${PN}-3.0.1-opencv.patch" )
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src_configure() {
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	local mycmakeargs=(
......
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		"-DUSE_COIN3D=$(usex coin ON OFF)"
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		"-DUSE_DC1394=$(usex ieee1394 ON OFF)"
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		"-DUSE_DMTX=$(usex dmtx ON OFF)"
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		"-DUSE_FFMPEG=$(usex ffmpeg ON OFF)"
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		"-DUSE_GSL=$(usex gsl ON OFF)"
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		"-DUSE_LAPACK=$(usex lapack ON OFF)"
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		"-DUSE_JPEG=$(usex jpeg ON OFF)"
Thank you!