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

Calculating dependencies ... done!
Dependency resolution took 1.05 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/libburn-1.5.8-r2::gentoo  USE="-debug -static-libs" 982 KiB
[ebuild  N     ] dev-libs/libisofs-1.5.8_p2::gentoo  USE="acl xattr zlib -debug -lfa-flags -projid -static-libs" 884 KiB
[ebuild  N     ] dev-libs/libisoburn-1.5.8_p2::gentoo  USE="acl readline xattr zlib -debug -external-filters -frontend-optional -launch-frontend -libedit -static-libs" 1710 KiB

Total: 3 packages (3 new), Size of downloads: 3576 KiB