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

Calculating dependencies ... done!
Dependency resolution took 1.08 s (backtrack: 0/20).

[ebuild  N     ] media-libs/opensubdiv-3.6.1-r1:0/3.6.1::gentoo  USE="X opengl openmp python -cuda -doc -examples -glfw -opencl -ptex -tbb -test -tutorials" 39791 KiB

Total: 1 package (1 new), Size of downloads: 39791 KiB