localhost ~ # emerge -ac

 * Always study the list of packages to be cleaned for any obvious
 * mistakes. Packages that are part of the world set will always
 * be kept.  They can be manually added to this set with
 * `emerge --noreplace <atom>`.  Packages that are listed in
 * package.provided (see portage(5)) will be removed by
 * depclean, even if they are part of the world set.
 * 
 * As a safety measure, depclean will not remove any packages
 * unless *all* required dependencies have been resolved.  As a
 * consequence of this, it often becomes necessary to run 
 * `emerge --update --newuse --deep @world` prior to depclean.

Calculating dependencies                  ... done!      
>>> Calculating removal order...

>>> These are the packages that would be unmerged:                                      

 app-text/recode
    selected: 3.6_p20-r1 
   protected: none 
     omitted: none 

 media-plugins/gst-plugins-gio
    selected: 0.10.36-r1 
   protected: none 
     omitted: none 

 media-libs/libechonest
    selected: 2.0.2 
   protected: none 
     omitted: none 

 media-plugins/gst-plugins-meta
    selected: 0.10-r10 
   protected: none 
     omitted: 1.10.3 

 media-plugins/gst-plugins-taglib
    selected: 0.10.31-r1 
   protected: none 
     omitted: 1.10.3 

 dev-libs/eb
    selected: 4.4.1-r1 
   protected: none 
     omitted: none 

 app-arch/lzip
    selected: 1.16 
   protected: none 
     omitted: none 

 sci-libs/indilib
    selected: 1.2.0 
   protected: none 
     omitted: none 

 dev-qt/qthelp
    selected: 5.6.2 
   protected: none 
     omitted: 4.8.6-r3 

 media-libs/vo-aacenc
    selected: 0.1.3 
   protected: none 
     omitted: none 

 sys-devel/gcc
    selected: 4.9.3 
   protected: none 
     omitted: 4.9.4 

 net-libs/rb_libtorrent
    selected: 0.16.17 
   protected: none 
     omitted: none 

 dev-libs/json-c
    selected: 0.12 
   protected: none 
     omitted: none 

 sys-libs/db
    selected: 4.8.30-r2 
   protected: none 
     omitted: 5.3.28-r2 

 dev-libs/geoip
    selected: 1.6.9-r1 
   protected: none 
     omitted: none 

 media-plugins/gst-plugins-wavpack
    selected: 0.10.31-r1 
   protected: none 
     omitted: 1.10.3 

 media-plugins/gst-plugins-opus
    selected: 0.10.23-r1 
   protected: none 
     omitted: 1.10.3 

 media-plugins/gst-plugins-flac
    selected: 0.10.31-r1 
   protected: none 
     omitted: 1.10.3 

 media-plugins/gst-plugins-dv
    selected: 0.10.31-r1 
   protected: none 
     omitted: 1.10.3 

 media-plugins/gst-plugins-v4l2
    selected: 0.10.31-r1 
   protected: none 
     omitted: 1.10.3 

 media-plugins/gst-plugins-dvdread
    selected: 0.10.19-r1 
   protected: none 
     omitted: 1.10.3 

 media-plugins/gst-plugins-soup
    selected: 0.10.31-r2 
   protected: none 
     omitted: 1.10.3 

 media-plugins/gst-plugins-lame
    selected: 0.10.19-r1 
   protected: none 
     omitted: 1.10.3 

 media-plugins/gst-plugins-mpeg2dec
    selected: 0.10.19-r1 
   protected: none 
     omitted: 1.10.3 

 media-plugins/gst-plugins-x264
    selected: 0.10.19-r1 
   protected: none 
     omitted: 1.10.3 

 media-plugins/gst-plugins-theora
    selected: 0.10.36-r1 
   protected: none 
     omitted: none 

 media-plugins/gst-plugins-cdparanoia
    selected: 0.10.36-r1 
   protected: none 
     omitted: 1.10.3 

 media-plugins/gst-plugins-mad
    selected: 0.10.19-r1 
   protected: none 
     omitted: 1.10.3 

 media-plugins/gst-plugins-x
    selected: 0.10.36-r1 
   protected: none 
     omitted: none 

 media-plugins/gst-plugins-a52dec
    selected: 0.10.19-r1 
   protected: none 
     omitted: 1.10.3 

 media-plugins/gst-plugins-pulse
    selected: 0.10.31-r2 
   protected: none 
     omitted: 1.10.3 

 media-plugins/gst-plugins-musepack
    selected: 0.10.23-r1 
   protected: none 
     omitted: none 

 media-plugins/gst-plugins-vp8
    selected: 0.10.23-r3 
   protected: none 
     omitted: none 

 media-plugins/gst-plugins-faad
    selected: 0.10.23-r2 
   protected: none 
     omitted: 1.10.3 

 media-plugins/gst-plugins-ffmpeg
    selected: 0.10.13_p201211-r5 
   protected: none 
     omitted: none 

 media-plugins/gst-plugins-vorbis
    selected: 0.10.36-r1 
   protected: none 
     omitted: none 

 media-plugins/gst-plugins-alsa
    selected: 0.10.36-r1 
   protected: none 
     omitted: none 

 media-plugins/gst-plugins-dts
    selected: 0.10.23-r1 
   protected: none 
     omitted: 1.10.3 

 media-plugins/gst-plugins-libvisual
    selected: 0.10.36-r1 
   protected: none 
     omitted: 1.10.3 

 media-plugins/gst-plugins-xvid
    selected: 0.10.23-r1 
   protected: none 
     omitted: none 

 media-plugins/gst-plugins-dvb
    selected: 0.10.23-r1 
   protected: none 
     omitted: 1.10.3 

 media-plugins/gst-plugins-oss
    selected: 0.10.31-r1 
   protected: none 
     omitted: 1.10.3 

 media-plugins/gst-plugins-resindvd
    selected: 0.10.23-r1 
   protected: none 
     omitted: 1.10.3 

 sci-libs/cfitsio
    selected: 3.360 
   protected: none 
     omitted: none 

 sci-libs/gsl
    selected: 1.16 
   protected: none 
     omitted: none 

 sci-libs/libnova
    selected: 0.12.3 
   protected: none 
     omitted: none 

 dev-lang/cfortran
    selected: 4.4-r2 
   protected: none 
     omitted: none 

 app-eselect/eselect-cblas
    selected: 0.1 
   protected: none 
     omitted: none 

 media-plugins/gst-plugins-ogg
    selected: 0.10.36-r1 
   protected: none 
     omitted: none 

 media-plugins/gst-plugins-xvideo
    selected: 0.10.36-r1 
   protected: none 
     omitted: none 

 media-libs/gst-plugins-ugly
    selected: 0.10.19-r1 
   protected: none 
     omitted: 1.10.3 

 media-libs/gst-plugins-good
    selected: 0.10.31-r2 
   protected: none 
     omitted: 1.10.3 

 media-libs/gst-plugins-bad
    selected: 0.10.23-r4 
   protected: none 
     omitted: 1.10.3 

 media-libs/gst-plugins-base
    selected: 0.10.36-r2 
   protected: none 
     omitted: 1.10.3 

 media-libs/gstreamer
    selected: 0.10.36-r2 
   protected: none 
     omitted: 1.10.3 

 x11-libs/libva-vdpau-driver
    selected: 0.7.4-r4 
   protected: none 
     omitted: none 

 x11-libs/libvdpau
    selected: 1.1.1 
   protected: none 
     omitted: none 

 x11-libs/libva-intel-driver
    selected: 1.6.2 
   protected: none 
     omitted: none 

 x11-libs/libva
    selected: 1.6.2 
   protected: none 
     omitted: none 

All selected packages: =media-plugins/gst-plugins-dv-0.10.31-r1 =x11-libs/libvdpau-1.1.1 =media-plugins/gst-plugins-lame-0.10.19-r1 =media-plugins/gst-plugins-mad-0.10.19-r1 =media-plugins/gst-plugins-faad-0.10.23-r2 =media-plugins/gst-plugins-libvisual-0.10.36-r1 =media-plugins/gst-plugins-oss-0.10.31-r1 =media-plugins/gst-plugins-mpeg2dec-0.10.19-r1 =media-libs/gst-plugins-ugly-0.10.19-r1 =media-libs/gst-plugins-base-0.10.36-r2 =sys-devel/gcc-4.9.3 =media-libs/vo-aacenc-0.1.3 =sci-libs/indilib-1.2.0 =media-plugins/gst-plugins-vorbis-0.10.36-r1 =media-plugins/gst-plugins-alsa-0.10.36-r1 =media-plugins/gst-plugins-dvb-0.10.23-r1 =sci-libs/libnova-0.12.3 =media-libs/gst-plugins-good-0.10.31-r2 =media-libs/libechonest-2.0.2 =media-plugins/gst-plugins-meta-0.10-r10 =media-plugins/gst-plugins-taglib-0.10.31-r1 =media-plugins/gst-plugins-v4l2-0.10.31-r1 =app-text/recode-3.6_p20-r1 =media-plugins/gst-plugins-dts-0.10.23-r1 =media-plugins/gst-plugins-x-0.10.36-r1 =sci-libs/cfitsio-3.360 =media-plugins/gst-plugins-gio-0.10.36-r1 =media-plugins/gst-plugins-cdparanoia-0.10.36-r1 =media-plugins/gst-plugins-x264-0.10.19-r1 =app-eselect/eselect-cblas-0.1 =net-libs/rb_libtorrent-0.16.17 =media-plugins/gst-plugins-xvid-0.10.23-r1 =sci-libs/gsl-1.16 =media-plugins/gst-plugins-vp8-0.10.23-r3 =media-plugins/gst-plugins-ffmpeg-0.10.13_p201211-r5 =app-arch/lzip-1.16 =x11-libs/libva-1.6.2 =media-plugins/gst-plugins-a52dec-0.10.19-r1 =x11-libs/libva-intel-driver-1.6.2 =media-plugins/gst-plugins-dvdread-0.10.19-r1 =media-plugins/gst-plugins-resindvd-0.10.23-r1 =media-plugins/gst-plugins-opus-0.10.23-r1 =media-plugins/gst-plugins-xvideo-0.10.36-r1 =media-libs/gstreamer-0.10.36-r2 =dev-libs/eb-4.4.1-r1 =sys-libs/db-4.8.30-r2 =media-plugins/gst-plugins-soup-0.10.31-r2 =x11-libs/libva-vdpau-driver-0.7.4-r4 =media-plugins/gst-plugins-ogg-0.10.36-r1 =media-plugins/gst-plugins-flac-0.10.31-r1 =media-plugins/gst-plugins-theora-0.10.36-r1 =media-plugins/gst-plugins-musepack-0.10.23-r1 =dev-lang/cfortran-4.4-r2 =media-libs/gst-plugins-bad-0.10.23-r4 =dev-libs/json-c-0.12 =dev-qt/qthelp-5.6.2 =media-plugins/gst-plugins-pulse-0.10.31-r2 =media-plugins/gst-plugins-wavpack-0.10.31-r1 =dev-libs/geoip-1.6.9-r1

>>> 'Selected' packages are slated for removal.
>>> 'Protected' and 'omitted' packages will not be removed.

Would you like to unmerge these packages? [Yes/No] n

Quitting.

Packages installed:   1141
Packages in world:    109
Packages in system:   44
Required packages:    1082
Number to remove:     59

 * IMPORTANT: 20 news items need reading for repository 'gentoo'.
 * Use eselect news read to view new items.

localhost ~ # emerge --update --newuse --deep @world

 * IMPORTANT: 20 news items need reading for repository 'gentoo'.
 * Use eselect news read to view new items.

Calculating dependencies                                           ... done!
>>> Auto-cleaning packages...

>>> No outdated packages were found on your system.
localhost ~ # revdep-rebuild
 * This is the new python coded version                                                 
 * Please report any bugs found using it.                                               
 * The original revdep-rebuild script is installed as revdep-rebuild.sh                 
 * Please file bugs at: https://bugs.gentoo.org/
 * Checking dynamic linking consistency

Your system is consistent