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

Calculating dependencies ... done!
Dependency resolution took 0.97 s (backtrack: 0/20).

[ebuild  N     ] sci-mathematics/pari-2.15.5:0/8::gentoo  USE="X gmp threads -data -doc -examples -fltk -test" 5066 KiB

Total: 1 package (1 new), Size of downloads: 5066 KiB