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

Calculating dependencies ... done!
Dependency resolution took 0.96 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/libusb-1.0.28:1::gentoo  USE="-debug -doc -examples -static-libs -test -udev" 643 KiB

Total: 1 package (1 new), Size of downloads: 643 KiB