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

Calculating dependencies ... done!
Dependency resolution took 1.17 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/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     ] media-libs/speexdsp-1.2.1::gentoo  CPU_FLAGS_X86="sse sse2" 901 KiB
[ebuild  N     ] media-libs/libepoxy-1.5.10-r3::gentoo  USE="X -test" 325 KiB
[ebuild  N     ] x11-libs/libXScrnSaver-1.2.5::gentoo  USE="-doc" 266 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/geolith-jg-0.5.0:1::gentoo  USE="-chdr" 432 KiB

Total: 13 packages (13 new), Size of downloads: 19615 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/geolith-jg-0.5.0::gentoo
# required by =games-emulation/geolith-jg-0.5.0 (argument)
>=media-libs/libsdl3-3.4.18 udev