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

Calculating dependencies ... done!
Dependency resolution took 1.32 s (backtrack: 0/20).

[ebuild  N     ] dev-build/b2-5.5.3::gentoo  USE="-examples" 1198 KiB
[ebuild  N     ] dev-lang/duktape-2.7.0-r3:0/2.7.0::gentoo  1003 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     ] media-libs/giflib-6.1.3:0/7::gentoo  USE="-doc -static-libs" 460 KiB
[ebuild  N     ] media-sound/gsm-1.0.24-r1::gentoo  66 KiB
[ebuild  N     ] games-simulation/flightgear-data-2024.1.7::gentoo  1840620 KiB
[ebuild  N     ] acct-group/rtkit-0-r3::gentoo  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     ] acct-group/polkitd-0-r3::gentoo  0 KiB
[ebuild  N     ] virtual/jpeg-100-r1::gentoo  USE="-static-libs" 0 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     ] media-libs/glew-2.2.0-r1:0/2.2::gentoo  USE="-doc -egl-only -static-libs" 817 KiB
[ebuild  N     ] media-libs/plib-1.8.5-r4::gentoo  761 KiB
[ebuild  N     ] acct-user/rtkit-0-r3::gentoo  0 KiB
[ebuild  N     ] acct-user/polkitd-0-r3::gentoo  0 KiB
[ebuild  N     ] media-libs/speex-1.2.1-r2::gentoo  USE="vbr -utils -valgrind" CPU_FLAGS_X86="sse" 1019 KiB
[ebuild  N     ] media-libs/speexdsp-1.2.1::gentoo  CPU_FLAGS_X86="sse sse2" 901 KiB
[ebuild  N     ] dev-games/openscenegraph-3.6.5-r118:0/161::gentoo  USE="gif jpeg png tiff truetype zlib -collada -curl -debug -dicom -doc -egl -examples (-ffmpeg) -fltk (-fox) -gdal -glut -gstreamer -lua -openexr -openinventor -osgapps -pdf -sdl -sdl2 -svg -vnc -wxwidgets -xrandr" LUA_SINGLE_TARGET="lua5-1" 5646 KiB
[ebuild  N     ] sys-auth/polkit-126-r3::gentoo  USE="nls pam -elogind -examples -gtk -introspection -kde (-selinux) (-systemd) -test" 446 KiB
[ebuild  N     ] sys-auth/rtkit-0.14::gentoo  USE="(-selinux) (-systemd)" 41 KiB
[ebuild  N     ] media-libs/openal-1.25.2::gentoo  USE="alsa dbus (-coreaudio) -debug -gui -jack -oss -pipewire -portaudio -pulseaudio -sdl -sndio" CPU_FLAGS_X86="sse sse2 sse4_1" 1107 KiB
[ebuild  N     ] dev-games/simgear-2024.1.7::gentoo  USE="-ffmpeg -gdal -test" CPU_FLAGS_X86="sse2" 1759 KiB
[ebuild  N     ] games-simulation/flightgear-2024.1.7::gentoo  USE="dbus udev utils -gdal -qt6" CPU_FLAGS_X86="sse2" 9550 KiB
[ebuild  N     ] games-util/atlas-0.6.1_beta_pre20181202::gentoo  777 KiB

Total: 25 packages (25 new), Size of downloads: 2067145 KiB