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

Calculating dependencies ... done!
Dependency resolution took 1.00 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/double-conversion-3.4.0:0/3::gentoo  USE="-test" 6871 KiB
[ebuild  N     ] dev-libs/rapidjson-1.1.0_p20250205::gentoo  USE="-doc -examples -test" 1091 KiB
[ebuild  N     ] sci-libs/opencascade-7.8.1-r1:0/7.8::gentoo  USE="X json (opengl) truetype -debug -doc -freeimage -gles2 -jemalloc -optimize -tbb -test -testprograms -tk -vtk" 47297 KiB

Total: 3 packages (3 new), Size of downloads: 55259 KiB