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

Calculating dependencies ... done!
Dependency resolution took 1.37 s (backtrack: 0/20).

[ebuild  N     ] dev-lang/cfortran-20210827-r1::gentoo  USE="-examples -test" 101 KiB
[ebuild  N     ] dev-libs/double-conversion-3.4.0:0/3::gentoo  USE="-test" 6871 KiB
[ebuild  N     ] dev-libs/md4c-0.6.0::gentoo  USE="md2html -test" 263 KiB
[ebuild  N     ] sys-libs/mtdev-1.1.7::gentoo  295 KiB
[ebuild  N     ] x11-misc/xkeyboard-config-2.48::gentoo  USE="-test" 931 KiB
[ebuild  N     ] virtual/fortran-0-r1::gentoo  USE="openmp" 0 KiB
[ebuild  N     ] x11-libs/xcb-util-renderutil-0.3.10::gentoo  256 KiB
[ebuild  N     ] sci-libs/cfitsio-4.7.0:0/10-r1::gentoo  USE="bzip2 -curl -test -tools" 2113 KiB
[ebuild  N     ] sci-libs/gsl-2.7.1-r3:0/27::gentoo  USE="deprecated -cblas-external -static-libs" 7346 KiB
[ebuild  N     ] sci-astronomy/wcslib-8.3-r1:0/8::gentoo  USE="tools -doc -fits -fortran -pgplot -static-libs" 3170 KiB
[ebuild  N     ] x11-libs/libxkbcommon-1.13.2::gentoo  USE="X -doc -static-libs -test -tools -wayland" 1215 KiB
[ebuild  N     ] x11-libs/xcb-util-wm-0.4.2::gentoo  279 KiB
[ebuild  N     ] dev-libs/libevdev-1.13.7::gentoo  USE="-doc -test" 462 KiB
[ebuild  N     ] x11-libs/xcb-util-0.4.1::gentoo  262 KiB
[ebuild  N     ] x11-libs/xcb-util-image-0.4.1::gentoo  283 KiB
[ebuild  N     ] dev-libs/libinput-1.32.0:0/10::gentoo  USE="-doc -lua -test" INPUT_DEVICES="-wacom" LUA_SINGLE_TARGET="lua5-4" 944 KiB
[ebuild  N     ] x11-libs/xcb-util-cursor-0.1.6::gentoo  267 KiB
[ebuild  N     ] dev-qt/qtbase-6.11.2-r2:6/6.11.2::gentoo  USE="X concurrent dbus gui libinput network nls opengl sql sqlite ssl udev widgets xml (zstd) -accessibility -brotli -cups -custom-cflags -eglfs -evdev -gles2-only -gssapi -gtk -icu -io-uring (-journald) -libproxy -mysql -oci8 -odbc -postgres -renderdoc -sctp -syslog -test -tslib -vulkan -wayland" 49398 KiB
[ebuild  N     ] dev-qt/qttools-6.11.2:6/6.11.2::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" 9992 KiB
[ebuild  N     ] dev-qt/qttranslations-6.11.2:6/6.11.2::gentoo  USE="-custom-cflags" 1652 KiB
[ebuild  N     ] sci-libs/stellarsolver-2.8::gentoo  25954 KiB

Total: 21 packages (21 new), Size of downloads: 112044 KiB