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

Calculating dependencies ... done!
Dependency resolution took 1.82 s (backtrack: 0/20).

[ebuild  N     ] media-libs/giflib-6.1.3:0/7::gentoo  USE="-doc -static-libs" 460 KiB
[ebuild  N     ] media-libs/alsa-topology-conf-1.2.5.1-r1::gentoo  USE="-verify-sig" 12 KiB
[ebuild  N     ] media-libs/alsa-ucm-conf-1.2.16.1::gentoo  USE="-verify-sig" 83 KiB
[ebuild  N     ] dev-build/b2-5.5.3::gentoo  USE="-examples" 1198 KiB
[ebuild   R    ] sys-libs/zlib-1.3.2-r1:0/1::gentoo  USE="minizip* -static-libs -verify-sig" 1290 KiB
[ebuild  N     ] dev-libs/libpcre-8.45-r4:3::gentoo  USE="bzip2 cxx jit pcre16 readline (unicode) zlib -libedit -pcre32 -static-libs -valgrind" 1542 KiB
[ebuild  N     ] virtual/minizip-1.3.1:0/1::gentoo  USE="-static-libs" 0 KiB
[ebuild  N     ] media-libs/alsa-lib-1.2.16.1::gentoo  USE="python -debug -doc -verify-sig" PYTHON_SINGLE_TARGET="python3_14 -python3_12 -python3_13 (-python3_15)" 1104 KiB
[ebuild  N     ] dev-libs/boost-1.91.0-r2:0/1.91.0::gentoo  USE="bzip2 context nls python stacktrace zlib -debug -doc -icu -lzma -mpi -numpy -test -test-full -tools -zstd" PYTHON_TARGETS="python3_14 -python3_12 -python3_13" 199785 KiB
[ebuild  N     ] dev-libs/collada-dom-2.5.0-r3:0/25::gentoo  4404 KiB
[ebuild  N     ] x11-libs/libXcursor-1.2.3::gentoo  USE="-doc" 286 KiB
[ebuild  N     ] media-libs/libsdl2-2.32.10::gentoo  USE="X alsa dbus haptic joystick opengl sound video (-aqua) (-custom-cflags) -doc -fcitx -gles1 -gles2 -ibus -jack -kms -libsamplerate -nas -oss -pipewire -pulseaudio -sndio -static-libs -test -udev -vulkan -wayland -xscreensaver" CPU_FLAGS_X86="mmx sse sse2 sse3 -3dnow" 7452 KiB
[ebuild  N     ] media-libs/libsdl-1.2.78::gentoo  USE="X alsa joystick opengl sound video -test" 487 KiB
[ebuild  N     ] dev-games/openscenegraph-openmw-3.6_p20260130:0/162::gentoo  USE="collada gif jpeg png sdl tiff truetype zlib -curl -debug -dicom -doc -egl -examples -fltk -fox -gdal -gstreamer -lua -openexr -openinventor -osgapps -pdf -sdl2 -svg -vnc -wxwidgets -xrandr" LUA_SINGLE_TARGET="lua5-1" 5658 KiB

Total: 14 packages (13 new, 1 reinstall), Size of downloads: 223755 KiB

The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by virtual/minizip-1.3.1::gentoo[-static-libs]
# required by dev-libs/collada-dom-2.5.0-r3::gentoo
# required by dev-games/openscenegraph-openmw-3.6_p20260130::gentoo[collada]
# required by =dev-games/openscenegraph-openmw-3.6_p20260130 (argument)
>=sys-libs/zlib-1.3.2-r1 minizip