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

Calculating dependencies ... done!
Dependency resolution took 1.24 s (backtrack: 0/20).

[ebuild  N     ] dev-build/b2-5.5.3::gentoo  USE="-examples" 1198 KiB
[ebuild  N     ] dev-tcltk/tdom-0.9.6::gentoo  USE="threads -test" 1495 KiB
[ebuild  N     ] app-text/hunspell-1.7.2-r1:0/1.7::gentoo  USE="ncurses nls readline -static-libs" L10N="-af -bg -ca -cs -cy -da -de -de-1901 -el -en -eo -es -et -fo -fr -ga -gl -he -hr -hu -ia -id -is -it -kk -km -ku -lt -lv -mi -mk -ms -nb -nl -nn -pl -pt -pt-BR -ro -ru -sk -sl -sq -sv -sw -tn -uk -zu" 1501 KiB
[ebuild  N     ] dev-tcltk/itcl-4.3.7::gentoo  521 KiB
[ebuild  N     ] dev-tcltk/tclx-8.6.3::gentoo  USE="threads" 447 KiB
[ebuild  N     ] dev-util/indent-2.2.13-r1::gentoo  USE="nls" 465 KiB
[ebuild  N     ] dev-libs/libatomic_ops-7.10.0::gentoo  531 KiB
[ebuild  N     ] dev-lang/tk-8.6.17:0/8.6::gentoo  USE="threads truetype (-aqua) -debug -test -xscreensaver" 4486 KiB
[ebuild  N     ] dev-tcltk/tcllib-2.0::gentoo  USE="-examples -test" 14524 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/boehm-gc-8.2.12::gentoo  USE="large threads -cxx -static-libs" 1204 KiB
[ebuild  N     ] dev-embedded/sdcc-4.5.0::gentoo  USE="boehm-gc mcs51 sdcpp -device-lib -doc -ds390 -ds400 -ez80-z80 -f8 -hc08 -mos65c02 -mos6502 -non-free -packihx -pdk13 -pdk14 -pdk15 -pdk16 -pic14 -pic16 -r2k -r2ka -r3ka -r800 -s08 -sdcdb -sm83 -stm8 -tlcs90 -ucsim -z80 -z80n -z180" 47130 KiB
[ebuild  N     ] dev-tcltk/bwidget-1.10.1::gentoo  USE="-doc -test" 249 KiB
[ebuild  N     ] dev-tcltk/tkimg-2.1.0-r1::gentoo  USE="-doc -static-libs -test" 12050 KiB
[ebuild  N     ] dev-embedded/mcu8051ide-1.4.10-r1::gentoo  5790 KiB

Total: 15 packages (15 new), Size of downloads: 291368 KiB

The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by dev-embedded/mcu8051ide-1.4.10-r1::gentoo
# required by =dev-embedded/mcu8051ide-1.4.10-r1 (argument)
>=dev-embedded/sdcc-4.5.0 mcs51