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

Calculating dependencies ... done!
Dependency resolution took 1.76 s (backtrack: 0/20).


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

dev-libs/libxml2:2

  (dev-libs/libxml2-2.15.2:2/16::gentoo, installed) USE="python readline -doc -icu -static-libs -test" PYTHON_TARGETS="python3_13 -python3_11 -python3_12 -python3_14" pulled in by
    (no parents that aren't satisfied by other packages in this slot)

  (dev-libs/libxml2-2.15.4:2/16::gentoo, ebuild scheduled for merge) USE="icu python readline -doc -static-libs -test" PYTHON_TARGETS="python3_14 -python3_12 -python3_13" pulled in by
    dev-libs/libxml2:=[icu] required by (dev-qt/qtwebengine-6.11.2:6/6.11.2::gentoo, ebuild scheduled for merge) USE="alsa jumbo-build opengl pdfium qml system-icu widgets -accessibility -bindist -custom-cflags -designer -geolocation -kerberos -pulseaudio -screencast -test -vaapi -vulkan -webdriver"
                       ^^^                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

dev-libs/openssl:0

  (dev-libs/openssl-3.5.5-r2:0/3::gentoo, installed) USE="asm quic -fips -ktls -rfc3779 -sctp -static-libs -test -tls-compression -vanilla -verify-sig -weak-ssl-ciphers" CPU_FLAGS_X86="(sse2)" pulled in by
    (no parents that aren't satisfied by other packages in this slot)

  (dev-libs/openssl-3.6.5:0/3::gentoo, ebuild scheduled for merge) USE="asm quic -fips -ktls -rfc3779 -sctp -static-libs -test -tls-compression -vanilla -verify-sig -weak-ssl-ciphers" CPU_FLAGS_X86="(sse2)" pulled in by
    >=dev-libs/openssl-3.5.9:0= required by (net-libs/nodejs-26.12.0:0/26::gentoo, ebuild scheduled for merge) USE="icu inspector npm snapshot ssl system-ssl -debug -doc (-lto) -pax-kernel -system-icu -temporal -test" CPU_FLAGS_X86="sse2"
    ^^                 ^^^^^^^^                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   


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 x11-misc/xdg-utils-1.2.1-r11::gentoo
# required by kde-frameworks/kf-env-6::gentoo
# required by kde-frameworks/kcrash-6.31.0::gentoo
# required by dev-libs/kirigami-addons-1.15.0::gentoo
# required by kde-apps/marble-26.08.2::gentoo[kde]
# required by media-gfx/kphotoalbum-6.2.0::gentoo[map]
# required by =media-gfx/kphotoalbum-6.2.0 (argument)
>=app-text/xmlto-0.0.28-r11 text
# required by kde-apps/marble-26.08.2::gentoo[webengine,kde]
# required by media-gfx/kphotoalbum-6.2.0::gentoo[map]
# required by =media-gfx/kphotoalbum-6.2.0 (argument)
>=dev-qt/qtwebengine-6.11.2 qml
# required by kde-apps/marble-26.08.2::gentoo[kde]
# required by media-gfx/kphotoalbum-6.2.0::gentoo[map]
# required by =media-gfx/kphotoalbum-6.2.0 (argument)
>=dev-qt/qt5compat-6.11.2 qml
# required by dev-libs/kirigami-addons-1.15.0::gentoo
# required by kde-apps/marble-26.08.2::gentoo[kde]
# required by media-gfx/kphotoalbum-6.2.0::gentoo[map]
# required by =media-gfx/kphotoalbum-6.2.0 (argument)
>=dev-qt/qtmultimedia-6.11.2 qml
# required by kde-plasma/libplasma-6.8.0::gentoo
# required by dev-libs/kirigami-addons-1.15.0::gentoo
# required by kde-apps/marble-26.08.2::gentoo[kde]
# required by media-gfx/kphotoalbum-6.2.0::gentoo[map]
# required by =media-gfx/kphotoalbum-6.2.0 (argument)
>=kde-frameworks/kconfig-6.31.0 qml
# required by kde-plasma/libplasma-6.8.0::gentoo
# required by dev-libs/kirigami-addons-1.15.0::gentoo
# required by kde-apps/marble-26.08.2::gentoo[kde]
# required by media-gfx/kphotoalbum-6.2.0::gentoo[map]
# required by =media-gfx/kphotoalbum-6.2.0 (argument)
>=dev-qt/qtbase-6.11.2-r2 wayland
# required by kde-frameworks/qqc2-desktop-style-6.31.0::gentoo
# required by dev-libs/kirigami-addons-1.15.0::gentoo
# required by kde-apps/marble-26.08.2::gentoo[kde]
# required by media-gfx/kphotoalbum-6.2.0::gentoo[map]
# required by =media-gfx/kphotoalbum-6.2.0 (argument)
>=kde-frameworks/sonnet-6.31.0 qml
# required by dev-qt/qtwebengine-6.11.2::gentoo
# required by kde-apps/marble-26.08.2::gentoo[webengine,kde]
# required by media-gfx/kphotoalbum-6.2.0::gentoo[map]
# required by =media-gfx/kphotoalbum-6.2.0 (argument)
>=dev-libs/libxml2-2.15.4 icu
# required by dev-qt/qtwebengine-6.11.2::gentoo
# required by kde-apps/marble-26.08.2::gentoo[webengine,kde]
# required by media-gfx/kphotoalbum-6.2.0::gentoo[map]
# required by =media-gfx/kphotoalbum-6.2.0 (argument)
>=dev-qt/qtwebchannel-6.11.2 qml
# required by net-libs/nodejs-26.12.0::gentoo
# required by dev-qt/qtwebengine-6.11.2::gentoo
# required by kde-apps/marble-26.08.2::gentoo[webengine,kde]
# required by media-gfx/kphotoalbum-6.2.0::gentoo[map]
# required by =media-gfx/kphotoalbum-6.2.0 (argument)
>=dev-cpp/simdutf-9.2.1 atomic-base64
# required by kde-frameworks/krunner-6.31.0::gentoo
# required by kde-apps/marble-26.08.2::gentoo[kde]
# required by media-gfx/kphotoalbum-6.2.0::gentoo[map]
# required by =media-gfx/kphotoalbum-6.2.0 (argument)
>=kde-frameworks/kwindowsystem-6.31.0 wayland
# required by dev-qt/qtpositioning-6.11.2::gentoo[qml]
# required by kde-apps/marble-26.08.2::gentoo[geolocation]
# required by media-gfx/kphotoalbum-6.2.0::gentoo[map]
# required by =media-gfx/kphotoalbum-6.2.0 (argument)
>=dev-qt/qtdeclarative-6.11.2-r1 wayland

 * 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.