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

Calculating dependencies ... done!
Dependency resolution took 0.95 s (backtrack: 0/20).


The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by media-sound/drumstick-2.11.1::gentoo
# required by media-sound/kmidimon-1.4.0::gentoo
# required by =media-sound/kmidimon-1.4.0 (argument)
>=dev-qt/qttools-6.11.2 designer

!!! The ebuild selected to satisfy ">=dev-qt/qttools-6.7.2:6[designer]" has unmet requirements.
- dev-qt/qttools-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"

  The following REQUIRED_USE flag constraints are unsatisfied:
    designer? ( qml )

  The above constraints are a subset of the following complete expression:
    assistant? ( widgets ) designer? ( qml widgets ) distancefieldgenerator? ( qml widgets ) pixeltool? ( widgets ) qdoc? ( qml exactly-one-of ( llvm_slot_17 llvm_slot_18 llvm_slot_19 llvm_slot_20 llvm_slot_21 llvm_slot_22 ) ) qmlls? ( assistant qml )

(dependency required by "media-sound/drumstick-2.11.1::gentoo" [ebuild])
(dependency required by "media-sound/kmidimon-1.4.0::gentoo" [ebuild])
(dependency required by "=media-sound/kmidimon-1.4.0" [argument])