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

Calculating dependencies ... done!
Dependency resolution took 1.07 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/libtommath-1.3.0::gentoo  USE="-doc -examples -static-libs" 628 KiB
[ebuild  N     ] dev-libs/libzip-1.12.1:0/5::gentoo  USE="bzip2 ssl -gnutls -lzma -test -tools -zstd" 795 KiB
[ebuild  N     ] app-text/convertlit-1.8-r4::gentoo  132 KiB
[ebuild  N     ] app-text/ebook-tools-0.2.2-r4::gentoo  USE="lit2epub" 46 KiB

Total: 4 packages (4 new), Size of downloads: 1600 KiB