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

Calculating dependencies ... done!
Dependency resolution took 1.81 s (backtrack: 0/20).

[ebuild  N     ] media-libs/jg-2.0.0:1::gentoo  15 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-libs/lzo-2.10:2::gentoo  USE="(split-usr) -examples -static-libs" 587 KiB
[ebuild  N     ] dev-libs/trio-1.17.1::gentoo  USE="-doc" 456 KiB
[ebuild  N     ] media-libs/libsamplerate-0.2.2::gentoo  USE="-test" 3242 KiB
[ebuild   R    ] sys-libs/zlib-1.3.2-r1:0/1::gentoo  USE="minizip* -static-libs -verify-sig" 1290 KiB
[ebuild  N     ] media-libs/speexdsp-1.2.1::gentoo  CPU_FLAGS_X86="sse sse2" 901 KiB
[ebuild  N     ] media-libs/flac-1.5.0:0/11-14::gentoo  USE="cxx -debug -ogg -static-libs" CPU_FLAGS_X86="avx avx2" 1054 KiB
[ebuild  N     ] virtual/minizip-1.3.1:0/1::gentoo  USE="-static-libs" 0 KiB
[ebuild  N     ] dev-libs/miniz-3.1.2:0/3.1.2::gentoo  284 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     ] x11-libs/libXScrnSaver-1.2.5::gentoo  USE="-doc" 266 KiB
[ebuild  N     ] media-libs/libepoxy-1.5.10-r3::gentoo  USE="X -test" 325 KiB
[ebuild  N     ] x11-libs/libXcursor-1.2.3::gentoo  USE="-doc" 286 KiB
[ebuild  N     ] x11-libs/libXtst-1.2.5::gentoo  USE="-doc" 285 KiB
[ebuild  N     ] media-libs/libsdl3-3.4.18::gentoo  USE="X alsa dbus opengl udev (-aqua) -bidi -doc -ibus -io-uring -jack -kms -oss -pipewire -pulseaudio -sndio -test -usb -vulkan -wayland" CPU_FLAGS_X86="avx avx2 avx512f mmx sse sse2 sse3 sse4_1 sse4_2" 15285 KiB
[ebuild  N     ] games-emulation/jgrf-2.0.1:1::gentoo  USE="-vulkan" 343 KiB
[ebuild  N     ] games-emulation/bsnes-jg-2.1.1:1::gentoo  USE="jgmodule -doc -examples -shared" 4235 KiB
[ebuild  N     ] games-emulation/cega-jg-0.6.3:1::gentoo  369 KiB
[ebuild  N     ] games-emulation/cen64-jg-0.4.1::gentoo  442 KiB
[ebuild  N     ] games-emulation/gambatte-jg-0.6.1:1::gentoo  USE="jgmodule -doc -examples -shared" 375 KiB
[ebuild  N     ] games-emulation/geolith-jg-0.5.0:1::gentoo  USE="-chdr" 432 KiB
[ebuild  N     ] games-emulation/jollycv-jg-2.1.0:1::gentoo  USE="jgmodule -doc -examples -shared" 239 KiB
[ebuild  N     ] games-emulation/mednafen-jg-1.32.1.2:1::gentoo  CPU_FLAGS_X86="avx" 4312 KiB
[ebuild  N     ] games-emulation/mgba-jg-0.10.5.1:1::gentoo  12655 KiB
[ebuild  N     ] games-emulation/nestopia-jg-2.0.0:1::gentoo  653 KiB
[ebuild  N     ] games-emulation/prosystem-jg-1.5.4:1::gentoo  127 KiB
[ebuild  N     ] games-emulation/vecx-jg-1.2.4:1::gentoo  204 KiB
[ebuild  N     ] games-emulation/jgemu-1.0.0-r2:1::gentoo  USE="bsnes cega cen64 gambatte geolith jollycv mednafen mgba nestopia prosystem vecx -melonds -sameboy" 0 KiB

Total: 30 packages (29 new, 1 reinstall), Size of downloads: 49848 KiB

The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by games-emulation/jgrf-2.0.1::gentoo
# required by games-emulation/bsnes-jg-2.1.1::gentoo[jgmodule]
# required by games-emulation/jgemu-1.0.0-r2::gentoo[bsnes]
# required by =games-emulation/jgemu-1.0.0-r2 (argument)
>=media-libs/libsdl3-3.4.18 udev
# required by virtual/minizip-1.3.1::gentoo[-static-libs]
# required by games-emulation/mednafen-jg-1.32.1.2::gentoo
# required by games-emulation/jgemu-1.0.0-r2::gentoo[mednafen]
# required by =games-emulation/jgemu-1.0.0-r2 (argument)
>=sys-libs/zlib-1.3.2-r1 minizip