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

Calculating dependencies ... done!
Dependency resolution took 2.72 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/glib:2

  (dev-libs/glib-2.84.4-r2:2/2::gentoo, installed) USE="dbus elf mime xattr -debug -doc -introspection (-selinux) -static-libs -sysprof -systemtap -test -utils" pulled in by
    (no parents that aren't satisfied by other packages in this slot)

  (dev-libs/glib-2.88.3:2/2::gentoo, ebuild scheduled for merge) USE="dbus elf introspection mime xattr -debug -doc (-selinux) -static-libs -sysprof -systemtap -test -utils" pulled in by
    >=dev-libs/glib-2.82.0:2[introspection] required by (dev-libs/gobject-introspection-1.86.0-r1:0/0::gentoo, ebuild scheduled for merge) USE="-doctool -gtk-doc -test" PYTHON_SINGLE_TARGET="python3_14 -python3_12 -python3_13"
                             ^^^^^^^^^^^^^                                                                                                                                                                                                                                                                                                                                              

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 system-icu widgets -accessibility -bindist -custom-cflags -designer -geolocation -kerberos -pulseaudio -qml -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"
    ^^                 ^^^^^^^^                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

sys-libs/zlib:0

  (sys-libs/zlib-1.3.2-r1:0/1::gentoo, installed) USE="-minizip -static-libs -verify-sig" pulled in by
    (no parents that aren't satisfied by other packages in this slot)

  (sys-libs/zlib-1.3.2-r1:0/1::gentoo, ebuild scheduled for merge) USE="minizip -static-libs -verify-sig" pulled in by
    >=sys-libs/zlib-1.3.1[abi_x86_32(-)?,abi_x86_64(-)?,abi_x86_x32(-)?,abi_mips_n32(-)?,abi_mips_n64(-)?,abi_mips_o32(-)?,abi_s390_32(-)?,abi_s390_64(-)?,minizip] required by (virtual/minizip-1.3.1:0/1::gentoo, ebuild scheduled for merge) USE="-static-libs"
                                                                                                                                                           ^^^^^^^                                                                                                                                                       


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 kde-frameworks/purpose-6.31.0::gentoo
# required by kde-apps/kdecore-meta-26.04.3::gentoo[share]
# required by =kde-apps/kdecore-meta-26.04.3 (argument)
>=kde-frameworks/prison-6.31.0 qml
# required by x11-misc/xdg-utils-1.2.1-r11::gentoo
# required by kde-frameworks/kf-env-6::gentoo
# required by kde-apps/libkexiv2-26.08.2::gentoo
# required by kde-apps/kio-extras-26.08.2::gentoo
# required by kde-apps/dolphin-26.08.2::gentoo
# required by kde-apps/kdecore-meta-26.04.3::gentoo
# required by =kde-apps/kdecore-meta-26.04.3 (argument)
>=app-text/xmlto-0.0.28-r11 text
# required by kde-frameworks/kio-6.31.0::gentoo
# required by kde-apps/kio-extras-26.08.2::gentoo
# required by kde-apps/dolphin-26.08.2::gentoo
# required by kde-apps/kdecore-meta-26.04.3::gentoo
# required by =kde-apps/kdecore-meta-26.04.3 (argument)
>=dev-qt/qtbase-6.11.2-r2 libproxy icu wayland
# required by dev-libs/gobject-introspection-1.86.0-r1::gentoo
# required by dev-python/pygobject-3.58.0::gentoo
# required by sys-libs/libblockdev-3.5.0::gentoo[python_single_target_python3_14,python]
# required by sys-fs/udisks-2.11.2::gentoo
# required by kde-frameworks/solid-6.31.0::gentoo
# required by kde-apps/kio-extras-26.08.2::gentoo
# required by kde-apps/dolphin-26.08.2::gentoo
# required by kde-apps/kdecore-meta-26.04.3::gentoo
# required by =kde-apps/kdecore-meta-26.04.3 (argument)
>=dev-libs/glib-2.88.3 introspection
# required by dev-qt/qtwebengine-6.11.2::gentoo
# required by www-client/falkon-26.08.2::gentoo
# required by kde-apps/kdecore-meta-26.04.3::gentoo[webengine]
# required by =kde-apps/kdecore-meta-26.04.3 (argument)
>=dev-libs/libxml2-2.15.4 icu
# required by net-libs/nodejs-26.12.0::gentoo
# required by dev-qt/qtwebengine-6.11.2::gentoo
# required by www-client/falkon-26.08.2::gentoo
# required by kde-apps/kdecore-meta-26.04.3::gentoo[webengine]
# required by =kde-apps/kdecore-meta-26.04.3 (argument)
>=dev-cpp/simdutf-9.2.1 atomic-base64
# required by kde-frameworks/kauth-6.31.0::gentoo[policykit]
# required by kde-frameworks/ktexteditor-6.31.0::gentoo
# required by kde-apps/kate-lib-26.08.2::gentoo
# required by kde-apps/kwrite-26.08.2::gentoo
# required by kde-apps/kdecore-meta-26.04.3::gentoo
# required by =kde-apps/kdecore-meta-26.04.3 (argument)
>=kde-frameworks/kwindowsystem-6.31.0 wayland
# required by kde-plasma/libplasma-6.8.0::gentoo
# required by kde-plasma/polkit-kde-agent-6.8.0::gentoo
# required by kde-frameworks/kauth-6.31.0::gentoo[policykit]
# required by kde-frameworks/ktexteditor-6.31.0::gentoo
# required by kde-apps/kate-lib-26.08.2::gentoo
# required by kde-apps/kwrite-26.08.2::gentoo
# required by kde-apps/kdecore-meta-26.04.3::gentoo
# required by =kde-apps/kdecore-meta-26.04.3 (argument)
>=dev-qt/qt5compat-6.11.2 qml
# required by kde-plasma/libplasma-6.8.0::gentoo
# required by kde-plasma/polkit-kde-agent-6.8.0::gentoo
# required by kde-frameworks/kauth-6.31.0::gentoo[policykit]
# required by kde-frameworks/ktexteditor-6.31.0::gentoo
# required by kde-apps/kate-lib-26.08.2::gentoo
# required by kde-apps/kwrite-26.08.2::gentoo
# required by kde-apps/kdecore-meta-26.04.3::gentoo
# required by =kde-apps/kdecore-meta-26.04.3 (argument)
>=kde-frameworks/kconfig-6.31.0 qml
# required by virtual/minizip-1.3.1::gentoo[-static-libs]
# required by dev-qt/qtwebengine-6.11.2::gentoo
# required by www-client/falkon-26.08.2::gentoo
# required by kde-apps/kdecore-meta-26.04.3::gentoo[webengine]
# required by =kde-apps/kdecore-meta-26.04.3 (argument)
>=sys-libs/zlib-1.3.2-r1 minizip
# required by www-client/falkon-26.08.2::gentoo[python_single_target_python3_14,python]
# required by kde-apps/kdecore-meta-26.04.3::gentoo[webengine]
# required by =kde-apps/kdecore-meta-26.04.3 (argument)
>=dev-python/pyside-6.11.2 positioning uitools webengine

!!! The ebuild selected to satisfy ">=dev-python/pyside-6.11.2:6[gui,positioning,uitools(-),webengine,widgets,python_targets_python3_14(-)]" has unmet requirements.
- dev-python/pyside-6.11.2::gentoo USE="concurrent core dbus gui network opengl printsupport sql testlib widgets xml -3d -bluetooth -charts -debug -designer (-doc) -gles2-only -graphs -help -httpserver -location -multimedia -network-auth -nfc -numpy -pdfium -positioning -qml -quick -quick3d -remoteobjects -scxml -sensors -serialbus -serialport -spatialaudio -speech -svg -test -tools -uitools -webchannel -webengine -websockets -webview" LLVM_SLOT="22 -18 -19 -20 -21" PYTHON_TARGETS="python3_14 -python3_12 -python3_13"

  The following REQUIRED_USE flag constraints are unsatisfied:
    webengine? ( webchannel )

  The above constraints are a subset of the following complete expression:
    test? ( qml? ( quick ) ) concurrent? ( core ) 3d? ( gui network ) xml? ( core ) printsupport? ( widgets ) gui? ( core ) bluetooth? ( core ) quick? ( gui network qml ) webengine? ( core gui network printsupport webchannel ) testlib? ( widgets ) nfc? ( core ) websockets? ( network ) network-auth? ( network ) network? ( core ) charts? ( core gui widgets ) gles2-only? ( gui ) webview? ( gui quick webengine ) quick3d? ( gui network qml quick ) svg? ( gui ) dbus? ( core ) webchannel? ( core ) remoteobjects? ( core network ) uitools? ( widgets ) spatialaudio? ( core gui network multimedia ) httpserver? ( core concurrent network websockets ) graphs? ( core network gui qml quick quick3d ) pdfium? ( core gui network ) positioning? ( core ) location? ( core positioning ) designer? ( widgets ) scxml? ( core ) opengl? ( gui ) serialbus? ( core network serialport ) serialport? ( core ) sql? ( widgets ) widgets? ( gui ) qml? ( network ) help? ( widgets ) multimedia? ( core gui network ) sensors? ( core ) speech? ( core multimedia ) any-of ( python_targets_python3_12 python_targets_python3_13 python_targets_python3_14 ) exactly-one-of ( llvm_slot_18 llvm_slot_19 llvm_slot_20 llvm_slot_21 llvm_slot_22 )

(dependency required by "www-client/falkon-26.08.2::gentoo[python_single_target_python3_14,python]" [ebuild])
(dependency required by "kde-apps/kdecore-meta-26.04.3::gentoo[webengine]" [ebuild])
(dependency required by "=kde-apps/kdecore-meta-26.04.3" [argument])