# emerge -vn --backtrack=30 sys-apps/portage-mgorny

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

Calculating dependencies  . ...... done!
[ebuild  N     ] app-crypt/gentoo-keys-201607021514::proxy  32 KiB
[ebuild  N     ] dev-python/bz2file-0.98::proxy  PYTHON_TARGETS="python2_7 (-pypy)" 12 KiB
[ebuild  N    ~] app-portage/gemato-12.1::proxy  USE="blake2 bzip2 gpg -lzma -sha3 {-test}" PYTHON_TARGETS="python2_7 python3_5 -pypy -python3_4 -python3_6" 66 KiB
[ebuild  N    *] sys-apps/portage-mgorny-9999::gentoo  USE="(ipc) native-extensions xattr -build (-selinux)" PYTHON_TARGETS="python2_7 python3_5 -pypy -python3_4 -python3_6" 0 KiB
[uninstall     ] app-portage/repoman-2.3.6::proxy  PYTHON_TARGETS="python2_7 python3_5 -python3_4 -python3_6" 
[blocks b      ] app-portage/repoman ("app-portage/repoman" is blocking sys-apps/portage-mgorny-9999)
[blocks B      ] sys-apps/portage ("sys-apps/portage" is blocking sys-apps/portage-mgorny-9999)

Total: 4 packages (4 new, 1 uninstall), Size of downloads: 108 KiB
Conflict: 2 blocks (1 unsatisfied)

 * Error: The above package list contains packages which cannot be
 * installed at the same time on the same system.

  (sys-apps/portage-mgorny-9999:0/0::gentoo, ebuild scheduled for merge) pulled in by
    sys-apps/portage-mgorny

  (sys-apps/portage-2.3.24-r1:0/0::gentoo, installed) pulled in by
    sys-apps/portage required by (app-admin/perl-cleaner-2.25:0/0::gentoo, installed)
    sys-apps/portage[python_targets_python2_7(-)?,python_targets_python3_4(-)?,python_targets_python3_5(-)?,python_targets_python3_6(-)?,-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-),-python_single_target_python3_6(-)] (sys-apps/portage[python_targets_python2_7(-),python_targets_python3_5(-),-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-),-python_single_target_python3_6(-)]) required by (dev-java/java-config-2.2.0-r4:2/2::gentoo, installed)
    sys-apps/portage required by (virtual/package-manager-1:0/0::gentoo, installed)
    sys-apps/portage[python_targets_pypy(-)?,python_targets_python2_7(-)?,python_targets_python3_4(-)?,python_targets_python3_5(-)?,python_targets_python3_6(-)?,-python_single_target_pypy(-),-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-),-python_single_target_python3_6(-)] (sys-apps/portage[python_targets_python2_7(-),python_targets_python3_5(-),-python_single_target_pypy(-),-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-),-python_single_target_python3_6(-)]) required by (app-portage/layman-2.4.2-r1:0/0::gentoo, installed)
    >=sys-apps/portage-2.1 required by (sys-devel/crossdev-20171230:0/0::gentoo, installed)
    >=sys-apps/portage-2.1.6 required by (app-admin/haskell-updater-1.2.10:0/0::gentoo, installed)
    sys-apps/portage[python_targets_pypy(-)?,python_targets_python2_7(-)?,python_targets_python3_4(-)?,python_targets_python3_5(-)?,python_targets_python3_6(-)?,-python_single_target_pypy(-),-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-),-python_single_target_python3_6(-)] (sys-apps/portage[python_targets_python2_7(-),python_targets_python3_5(-),-python_single_target_pypy(-),-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-),-python_single_target_python3_6(-)]) required by (app-portage/gentoolkit-0.4.0:0/0::gentoo, installed)


For more information about Blocked Packages, please refer to the following
section of the Gentoo Linux x86 Handbook (architecture is irrelevant):

https://wiki.gentoo.org/wiki/Handbook:X86/Working/Portage#Blocked_packages


!!! The following installed packages are masked:
- media-sound/mp3gain-1.5.2::gentoo (masked by: package.mask)
/usr/portage/profiles/package.mask:
# Pacho Ramos <pacho@gentoo.org> (18 Mar 2018)
# Security vulnerable (#630954, #635548). Removal in a month.

- games-emulation/sdlmame-0.174::gentoo (masked by: package.mask)
/usr/portage/profiles/package.mask:
# Pacho Ramos <pacho@gentoo.org> (18 Mar 2018)
# Fails to build (#634662), version bump long time pending (#596162).
# Removal in a month.

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