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

Calculating dependencies ... done!
Dependency resolution took 1.03 s (backtrack: 0/20).

[ebuild  N     ] media-libs/giflib-6.1.3:0/7::gentoo  USE="-doc -static-libs" 460 KiB
[ebuild  N     ] media-libs/leptonica-1.87.0:0/6::gentoo  USE="gif jpeg jpeg2k png tiff zlib -static-libs -test -utils -webp" 14456 KiB
[ebuild  N     ] media-libs/jbig2enc-0.29-r1::gentoo  USE="gif jpeg png tiff -webp" 1083 KiB

Total: 3 packages (3 new), Size of downloads: 15998 KiB