запутался в зависимостях к софту.

Это понятно.
Спасибо.

Что-то не помогло.
serv0 ~ # emerge -auvDN world

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild U ~] media-libs/libpng-1.6.20:0/16::gentoo [1.6.19:0/16::gentoo] USE="apng (-neon) -static-libs" ABI_X86="32 (64) (-x32)" 931 KiB
[ebuild U ] x11-proto/xproto-7.0.28::gentoo [7.0.27::gentoo] USE="-doc" ABI_X86="32 (64) (-x32)" 294 KiB
[ebuild U ] x11-proto/kbproto-1.0.7::gentoo [1.0.6-r1::gentoo] ABI_X86="32 (64) (-x32)" 245 KiB
[ebuild U ~] dev-libs/nspr-4.11::gentoo [4.10.10-r1::gentoo] USE="-debug" ABI_X86="32 (64) (-x32)" 1 108 KiB
[ebuild U ] media-fonts/font-util-1.3.1::gentoo [1.3.0::gentoo] 150 KiB
[ebuild U ] x11-proto/randrproto-1.5.0::gentoo [1.4.0-r1::gentoo] ABI_X86="32 (64) (-x32)" 139 KiB
[ebuild U ] x11-libs/libdrm-2.4.65::gentoo [2.4.59::gentoo] USE="libkms -static-libs -valgrind%" ABI_X86="32 (64) (-x32)" VIDEO_CARDS="-amdgpu% (-exynos) (-freedreno) -intel -nouveau (-omap) -radeon (-tegra) -vmware" 631 KiB
[ebuild U ] x11-libs/libpciaccess-0.13.4::gentoo [0.13.3::gentoo] USE="zlib -static-libs" ABI_X86="32 (64) (-x32)" 364 KiB
[ebuild U ] x11-libs/libXdmcp-1.1.2::gentoo [1.1.1-r1::gentoo] USE="-doc -static-libs" ABI_X86="32 (64) (-x32)" 324 KiB
[ebuild U ] x11-libs/libfontenc-1.1.3::gentoo [1.1.2::gentoo] USE="-static-libs" 295 KiB
[ebuild U ] media-fonts/font-alias-1.0.3-r1::gentoo [1.0.3::gentoo] 0 KiB
[ebuild U ] x11-apps/xlsatoms-1.1.2::gentoo [1.1.1::gentoo] 121 KiB
[ebuild U ] x11-base/xorg-drivers-1.17::gentoo [1.16::gentoo] INPUT_DEVICES="keyboard mouse -acecad -aiptek -elographics -evdev -fpit -hyperpen -joystick (-libinput) -mutouch -penmount -synaptics -tslib -vmmouse -void -wacom" VIDEO_CARDS="nvidia -amdgpu% -apm -ast -chips -cirrus -dummy -epson -fbdev -fglrx (-freedreno) (-geode) -glint -i128 (-i740) -intel -mach64 -mga -neomagic -nouveau -nv (-omap) (-omapfb) -qxl -r128 -radeon -radeonsi -rendition -s3 -s3virge -savage -siliconmotion -sisusb (-sunbw2) (-suncg14) (-suncg3) (-suncg6) (-sunffb) (-sunleo) (-suntcx) -tdfx (-tegra) -tga -trident -tseng -vesa -via -virtualbox -vmware (-voodoo) (-modesetting%) (-v4l%)" 0 KiB
[ebuild N ] app-misc/c_rehash-1.7-r1::gentoo 0 KiB
[ebuild U ] dev-libs/openssl-1.0.2e::gentoo [1.0.2d::gentoo] USE="asm tls-heartbeat zlib -bindist -gmp -kerberos -rfc3779 -sctp -static-libs {-test} -vanilla" ABI_X86="32 (64) (-x32)" CPU_FLAGS_X86="(sse2)" 5 134 KiB
[blocks b ] [ebuild U ] x11-libs/xcb-util-cursor-0.1.2::gentoo [0.1.1-r1::gentoo] USE="-doc -static-libs {-test}" ABI_X86="32 (64) (-x32)" 283 KiB
[ebuild U ] x11-libs/libxcb-1.11.1:0/1.11.1::gentoo [1.11-r1:0/1.11::gentoo] USE="xkb -doc (-selinux) -static-libs {-test}" ABI_X86="32 (64) (-x32)" 508 KiB
[ebuild U ] sys-apps/portage-2.2.24::gentoo [2.2.20.1::gentoo] USE="(ipc) xattr -build -doc -epydoc (-selinux)" LINGUAS="ru" PYTHON_TARGETS="python2_7 python3_4 (-pypy) -python3_3 (-python3_5)" 950 KiB
[ebuild U ] x11-libs/libX11-1.6.3::gentoo [1.6.2::gentoo] USE="-doc -ipv6 -static-libs {-test}" ABI_X86="32 (64) (-x32)" 2 309 KiB
[ebuild U ] x11-libs/libXrender-0.9.9::gentoo [0.9.8::gentoo] USE="-static-libs" ABI_X86="32 (64) (-x32)" 300 KiB
[ebuild U ] x11-libs/libxkbfile-1.0.9::gentoo [1.0.8::gentoo] USE="-static-libs" 340 KiB
[ebuild U ] x11-apps/xmodmap-1.0.9::gentoo [1.0.8::gentoo] 140 KiB
[ebuild U ] x11-apps/xcmsdb-1.0.5::gentoo [1.0.4::gentoo] 143 KiB
[ebuild U ] x11-libs/libXi-1.7.5::gentoo [1.7.4::gentoo] USE="-doc -static-libs" ABI_X86="32 (64) (-x32)" 454 KiB
[ebuild U ] x11-libs/libXrandr-1.5.0::gentoo [1.4.2::gentoo] USE="-static-libs" ABI_X86="32 (64) (-x32)" 308 KiB
[ebuild U ] x11-libs/libXvMC-1.0.9::gentoo [1.0.8::gentoo] USE="-static-libs" ABI_X86="32 (64) (-x32)" 306 KiB
[ebuild U ] x11-apps/xvinfo-1.1.3::gentoo [1.1.2::gentoo] 121 KiB
[ebuild U ] x11-apps/xgamma-1.0.6::gentoo [1.0.5::gentoo] 121 KiB
[ebuild U ] x11-apps/xkbevd-1.1.4::gentoo [1.1.3::gentoo] 149 KiB
[ebuild U ] x11-misc/xkeyboard-config-2.16::gentoo [2.14::gentoo] 946 KiB
[ebuild U ] x11-apps/xev-1.2.2::gentoo [1.2.1::gentoo] 130 KiB
[ebuild U ] x11-apps/xinput-1.6.2::gentoo [1.6.1::gentoo] 155 KiB
[ebuild U ] x11-apps/xdpyinfo-1.3.2::gentoo [1.3.1::gentoo] USE="-dga -dmx -xinerama" 139 KiB
[ebuild U ] x11-apps/setxkbmap-1.3.1::gentoo [1.3.0::gentoo] 131 KiB
[ebuild U ] dev-python/certifi-2015.11.20::gentoo [2015.9.6.2::gentoo] PYTHON_TARGETS="python2_7 python3_4 (-pypy) (-pypy3) -python3_3 (-python3_5)" 356 KiB
[ebuild U ] x11-libs/libXt-1.1.5::gentoo [1.1.4::gentoo] USE="-static-libs" ABI_X86="32 (64) (-x32)" 754 KiB
[ebuild U ] x11-apps/xauth-1.0.9-r2::gentoo [1.0.9-r1::gentoo] USE="-ipv6" 0 KiB
[ebuild U ] x11-apps/x11perf-1.6.0::gentoo [1.5.4::gentoo] 187 KiB
[ebuild U ] x11-apps/xhost-1.0.7::gentoo [1.0.6::gentoo] USE="-ipv6" 133 KiB
[ebuild U ] x11-apps/smproxy-1.0.6::gentoo [1.0.5::gentoo] 129 KiB
[ebuild U ] x11-libs/libXaw-1.0.13::gentoo [1.0.12::gentoo] USE="-deprecated -doc -static-libs" ABI_X86="32 (64) (-x32)" 659 KiB
[ebuild U ] x11-apps/xinit-1.3.4-r1::gentoo [1.3.3-r1::gentoo] USE="minimal -systemd%" 162 KiB
[ebuild NS ] dev-lang/php-5.6.14:5.6::gentoo [5.4.45:5.4::gentoo] USE="bcmath berkdb bzip2 cli crypt ctype curl fileinfo filter fpm gdbm hash iconv json mysql mysqli nls opcache pdo phar posix readline session simplexml sockets ssl sysvipc tokenizer unicode xml xmlreader xmlwriter zip zlib -apache2 -calendar -cdb -cgi -cjk -debug -embed -enchant -exif (-firebird) -flatfile (-frontbase) -ftp -gd -gmp -imap -inifile -intl -iodbc -ipv6 -kerberos -ldap -ldap-sasl -libedit -libmysqlclient -mhash -mssql -oci8-instant-client -odbc -pcntl -postgres -qdbm -recode (-selinux) -sharedmem -snmp -soap -spell -sqlite -sybase-ct -systemd -threads -tidy -truetype -vpx -wddx -xmlrpc -xpm -xslt" 13 745 KiB
[ebuild NS ] virtual/httpd-php-5.6:5.6::gentoo [5.4-r1:5.4::gentoo] 0 KiB
[ebuild U ] app-eselect/eselect-opengl-1.3.1-r4::gentoo [1.2.7::gentoo] 3 KiB
[ebuild U ] media-libs/mesa-11.0.6::gentoo [10.3.7-r1::gentoo] USE="classic dri3 egl gallium gbm llvm nptl udev xvmc -bindist -d3d9% -debug -gles1 -gles2 -opencl -openmax -osmesa -pax_kernel -pic (-selinux) -vaapi% -vdpau -wayland -xa (-openvg%)" ABI_X86="32 (64) (-x32)" VIDEO_CARDS="(-freedreno) -i915 -i965 -ilo -intel -nouveau -r100 -r200 -r300 -r600 -radeon -radeonsi -vmware" 7 103 KiB
[blocks b ] =media-libs/mesa-10.3.7-r1 ("=media-libs/mesa-10.3.7-r1" is blocking app-eselect/eselect-opengl-1.3.1-r4)
[ebuild UD ] x11-base/xorg-server-1.16.4-r5:0/1.16.1::gentoo [1.17.4:0/1.17.4::gentoo] USE="nptl suid udev xorg -dmx -doc -glamor -ipv6 -kdrive -minimal (-selinux) -static-libs -systemd -tslib -unwind -wayland -xnest -xvfb (-libressl%) (-xephyr%)" 0 KiB
[ebuild U ] media-libs/libepoxy-1.3.1::gentoo [1.2::gentoo] USE="{-test}" ABI_X86="32 (64) (-x32)" 278 KiB
[ebuild U ] x11-drivers/xf86-input-keyboard-1.8.1::gentoo [1.8.0::gentoo] 312 KiB
[ebuild U ] x11-apps/xdriinfo-1.0.5::gentoo [1.0.4::gentoo] 119 KiB
[ebuild UD ] x11-drivers/nvidia-drivers-340.93-r1:0/340::gentoo [340.96:0/340::gentoo] USE="X multilib tools -acpi -pax_kernel -uvm" 0 KiB

Total: 51 packages (46 upgrades, 2 downgrades, 1 new, 2 in new slots), Size of downloads: 41 589 KiB
Conflict: 2 blocks

!!! Multiple package instances within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:

x11-base/xorg-server:0

(x11-base/xorg-server-1.17.4:0/1.17.4::gentoo, installed) pulled in by
(no parents that aren't satisfied by other packages in this slot)

(x11-base/xorg-server-1.16.4-r5:0/1.16.1::gentoo, ebuild scheduled for merge) pulled in by
x11-base/xorg-server:0/1.16.1= required by (x11-drivers/xf86-input-mouse-1.9.1:0/0::gentoo, installed)
^^^^^^^^^^

x11-libs/libxcb:0

(x11-libs/libxcb-1.11.1:0/1.11.1::gentoo, ebuild scheduled for merge) pulled in by
(no parents that aren't satisfied by other packages in this slot)

(x11-libs/libxcb-1.11-r1:0/1.11::gentoo, installed) pulled in by
>=x11-libs/libxcb-1.9.1:0/1.11=[abi_x86_32(-),abi_x86_64(-)] required by (x11-libs/xcb-util-0.4.0:0/0::gentoo, installed)
^^^^^^^^
(and 4 more with the same problem)

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. You may want to try a larger value of
the --backtrack option, such as --backtrack=30, in order to see if
that will solve this conflict automatically.

For more information, see MASKED PACKAGES section in the emerge man
page or refer to the Gentoo Handbook.

!!! The following installed packages are masked:
- dev-lang/php-5.4.45::gentoo (masked by: package.mask)
/usr/portage/profiles/package.mask:
# Brian Evans (02 Dec 2015)
# PHP 5.4 is End Of Life and will not receive any further updates
# Please migrate to 5.5 or, preferably 5.6.

For more information, see the MASKED PACKAGES section in the emerge
man page or refer to the Gentoo Handbook.

serv0 ~ # emerge -uN --nodeps @world -av

These are the packages that would be merged, in order:

Total: 0 packages, Size of downloads: 0 KiB

Nothing to merge; quitting.

serv0 ~ #