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

Calculating dependencies ... done!
Dependency resolution took 1.96 s (backtrack: 0/20).

[ebuild  N     ] sys-libs/mtdev-1.1.7::gentoo  295 KiB
[ebuild  N     ] x11-libs/xcb-util-renderutil-0.3.10::gentoo  256 KiB
[ebuild  N     ] x11-libs/xcb-util-wm-0.4.2::gentoo  279 KiB
[ebuild  N     ] x11-libs/xcb-util-0.4.1::gentoo  262 KiB
[ebuild  N     ] x11-libs/xcb-util-image-0.4.1::gentoo  283 KiB
[ebuild  N     ] x11-apps/xprop-1.2.8::gentoo  144 KiB
[ebuild  N     ] x11-libs/xcb-util-cursor-0.1.6::gentoo  267 KiB
[ebuild  N     ] kde-frameworks/extra-cmake-modules-6.31.0::gentoo  USE="-doc -test" 339 KiB
[ebuild  N     ] dev-libs/double-conversion-3.4.0:0/3::gentoo  USE="-test" 6871 KiB
[ebuild  N     ] dev-libs/md4c-0.6.0::gentoo  USE="md2html -test" 263 KiB
[ebuild  N     ] x11-apps/xset-1.2.6::gentoo  143 KiB
[ebuild  N     ] app-text/iso-codes-4.20.1::gentoo  16024 KiB
[ebuild  N     ] dev-libs/libevdev-1.13.7::gentoo  USE="-doc -test" 462 KiB
[ebuild  N     ] x11-misc/xkeyboard-config-2.48::gentoo  USE="-test" 931 KiB
[ebuild  N     ] x11-libs/libxkbcommon-1.13.2::gentoo  USE="X -doc -static-libs -test -tools -wayland" 1215 KiB
[ebuild   R    ] app-text/xmlto-0.0.28-r11::gentoo  USE="text* -latex" 125 KiB
[ebuild  N     ] x11-misc/xdg-utils-1.2.1-r11::gentoo  USE="X dbus -doc -gnome -perl -plasma" 287 KiB
[ebuild  N     ] kde-frameworks/kf-env-6:6::gentoo  0 KiB
[ebuild  N     ] dev-libs/libinput-1.32.0:0/10::gentoo  USE="-doc -lua -test" INPUT_DEVICES="-wacom" LUA_SINGLE_TARGET="lua5-4" 944 KiB
[ebuild  N     ] dev-qt/qtbase-6.11.2-r2:6/6.11.2::gentoo  USE="X concurrent dbus gui icu libinput network nls opengl sql sqlite ssl udev widgets xml (zstd) -accessibility -brotli -cups -custom-cflags -eglfs -evdev -gles2-only -gssapi -gtk -io-uring (-journald) -libproxy -mysql -oci8 -odbc -postgres -renderdoc -sctp -syslog -test -tslib -vulkan -wayland" 49398 KiB
[ebuild  N     ] dev-qt/qttools-6.11.2:6/6.11.2::gentoo  USE="assistant linguist opengl qdbus widgets (zstd) -custom-cflags -designer -distancefieldgenerator -gles2-only -kmap2qmap -pixeltool -qdoc -qml -qmlls -qtattributionsscanner -qtdiag -qtplugininfo -vulkan" LLVM_SLOT="22 -17 -18 -19 -20 -21" 9992 KiB
[ebuild  N     ] dev-qt/qttranslations-6.11.2:6/6.11.2::gentoo  USE="-custom-cflags" 1652 KiB
[ebuild  N     ] kde-frameworks/kconfig-6.31.0:6/6.31::gentoo  USE="dbus -debug -qml -test" 386 KiB
[ebuild  N     ] kde-frameworks/kcodecs-6.31.0:6/6.31::gentoo  USE="-debug -test" 2425 KiB
[ebuild  N     ] kde-frameworks/kwidgetsaddons-6.31.0:6/6.31::gentoo  USE="-debug -designer -test" 4129 KiB
[ebuild  N     ] dev-qt/qtshadertools-6.11.2:6/6.11.2::gentoo  USE="-custom-cflags -test" 1189 KiB
[ebuild  N     ] dev-qt/qtdeclarative-6.11.2-r1:6/6.11.2::gentoo  USE="jit network opengl sql ssl widgets -accessibility -custom-cflags -qmlls -svg -vulkan -wayland" 37872 KiB
[ebuild  N     ] kde-frameworks/kguiaddons-6.31.0:6/6.31::gentoo  USE="X dbus -debug -test -wayland" 96 KiB
[ebuild  N     ] kde-frameworks/ki18n-6.31.0:6/6.31::gentoo  USE="-debug -test" PYTHON_SINGLE_TARGET="python3_14 -python3_12 -python3_13 (-python3_15)" 2979 KiB
[ebuild  N     ] kde-frameworks/kcoreaddons-6.31.0:6/6.31::gentoo  USE="dbus -debug -test" 2470 KiB
[ebuild  N     ] kde-frameworks/kcolorscheme-6.31.0:6/6.31::gentoo  USE="-debug" 51 KiB
[ebuild  N     ] kde-frameworks/kconfigwidgets-6.31.0:6/6.31::gentoo  USE="-debug -designer -test" 2436 KiB

Total: 32 packages (31 new, 1 reinstall), Size of downloads: 144451 KiB

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/kcodecs-6.31.0::gentoo
# required by kde-frameworks/kconfigwidgets-6.31.0::gentoo
# required by =kde-frameworks/kconfigwidgets-6.31.0 (argument)
>=app-text/xmlto-0.0.28-r11 text
# required by kde-frameworks/kcoreaddons-6.31.0::gentoo
# required by kde-frameworks/kconfigwidgets-6.31.0::gentoo
# required by =kde-frameworks/kconfigwidgets-6.31.0 (argument)
>=dev-qt/qtbase-6.11.2-r2 icu

 * 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.