These are the packages that would be merged, in reverse order: Calculating dependencies . ..... done! [nomerge ] gnome-base/gnome-3.24.2 [nomerge ] gnome-base/gnome-extra-apps-3.24.2 [nomerge ] gnome-extra/gnome-user-share-3.18.3 [nomerge ] www-apache/mod_dnssd-0.6-r1 [ebuild U ] net-dns/avahi-0.7-r1 [0.7] USE="qt5%*" [nomerge ] net-print/hplip-3.17.10 [ebuild U ] media-gfx/sane-backends-1.0.27-r1 [1.0.27] [ebuild U ] www-client/firefox-52.8.0 [52.6.0] [ebuild U ] www-client/chromium-67.0.3396.62 [64.0.3282.167] USE="(-system-ffmpeg*)" [ebuild U ] app-portage/elogviewer-2.7-r2 [2.7] [ebuild U ] x11-base/xorg-x11-7.4-r3 [7.4-r2] USE="fonts%*" [ebuild U ] app-office/libreoffice-6.0.3.2 [5.4.5.1] USE="-gtk2%" [nomerge ] gnome-extra/gnome-shell-extensions-3.24.3 [nomerge ] app-eselect/eselect-gnome-shell-extensions-20180306 [20120911] [nomerge ] gnome-base/gnome-shell-3.24.3 [nomerge ] gnome-extra/nm-applet-1.8.10-r1 [1.8.6] USE="gcr*" [nomerge ] net-misc/networkmanager-1.8.4 [ebuild U ] net-wireless/wpa_supplicant-2.6-r6 [2.6-r3] USE="-eapol_test% -privsep%" [nomerge ] x11-drivers/xf86-input-synaptics-1.9.1 [1.9.0] [nomerge ] x11-base/xorg-server-1.19.5-r2 [1.19.5] USE="-kdrive*" [nomerge ] x11-base/xorg-drivers-1.19 [ebuild U ] x11-drivers/xf86-input-evdev-2.10.6 [2.10.5] [ebuild U ] x11-drivers/xf86-video-intel-2.99.917_p20180214-r1 [2.99.917_p20170313] [ebuild U ] x11-drivers/xf86-input-synaptics-1.9.1 [1.9.0] [nomerge ] www-client/firefox-52.8.0 [52.6.0] [nomerge ] virtual/ffmpeg-9-r2 [nomerge ] media-video/ffmpeg-3.3.6 [ebuild U ] media-libs/libsdl2-2.0.8-r1 [2.0.4] USE="(-aqua) -libsamplerate%" [ebuild U ] app-editors/emacs-25.3-r4 [25.3-r1] [nomerge ] gnome-base/gnome-extra-apps-3.24.2 [nomerge ] gnome-extra/gnome-tweak-tool-3.24.1 [nomerge ] gnome-base/gnome-shell-3.24.3 [ebuild U ] gnome-base/gnome-control-center-3.24.4 [3.24.3] [nomerge ] gnome-base/gnome-extra-apps-3.24.2 [nomerge ] media-sound/sound-juicer-3.24.0 [nomerge ] app-cdr/brasero-3.12.2-r1 [ebuild U ] gnome-base/gvfs-1.32.2 [1.32.1-r1] [ebuild U ] sys-process/procps-3.3.15-r1 [3.3.12-r1] [nomerge ] net-print/hplip-3.17.10 [ebuild U ] dev-python/PyQt5-5.9.2 [5.7.1] [ebuild U ] dev-qt/qtbluetooth-5.9.4 [5.7.1] [ebuild U ] dev-qt/qtconcurrent-5.9.4 [5.7.1] [ebuild U ] dev-qt/qtprintsupport-5.9.4 [5.7.1] [ebuild U ] dev-qt/qtopengl-5.9.4 [5.7.1] [ebuild U ] dev-qt/qtnetwork-5.9.4 [5.7.1] USE="-libressl%" [ebuild U ] dev-qt/qtsvg-5.9.4-r2 [5.7.1] [ebuild U ] dev-qt/qtxml-5.9.4 [5.7.1] [ebuild U ] dev-qt/qtwidgets-5.9.4-r1 [5.7.1] USE="gtk%*" [ebuild U ] dev-qt/qtgui-5.9.4-r3 [5.7.1-r1] USE="-vnc%" [ebuild U ] dev-qt/qtdbus-5.9.4 [5.7.1] [nomerge ] app-portage/elogviewer-2.7-r2 [2.7] [nomerge ] dev-python/PyQt5-5.9.2 [5.7.1] [nomerge ] dev-qt/qtcore-5.9.4-r2 [5.7.1-r3] [blocks b ] =media-libs/x264-0.0.20130506:0/148=[abi_x86_64(-)] required by (media-video/ffmpeg-3.3.6:0/55.57.57::gentoo, installed) ^^^^^^^ It may be possible to solve this problem by using package.mask to prevent one of those packages from being selected. However, it is also possible that conflicting dependencies exist such that they are impossible to satisfy simultaneously. If such a conflict exists in the dependencies of two different packages, then those packages can not be installed simultaneously. For more information, see MASKED PACKAGES section in the emerge man page or refer to the Gentoo Handbook. The following USE changes are necessary to proceed: (see "package.use" in the portage(5) man page for more details) # required by sys-boot/os-prober-1.76-r1::gentoo # required by @selected # required by @world (argument) >=sys-boot/grub-2.02-r1 mount * In order to avoid wasting time, backtracking has terminated early * due to the above autounmask change(s). The --autounmask-backtrack=y * option can be used to force further backtracking, but there is no * guarantee that it will produce a solution. * IMPORTANT: 6 news items need reading for repository 'gentoo'. * Use eselect news read to view new items.