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

Calculating dependencies ... done!
Dependency resolution took 1.70 s (backtrack: 0/20).

[ebuild  N     ] dev-build/netsurf-buildsystem-1.10::gentoo  39 KiB
[ebuild  N     ] media-libs/libnsgif-1.0.0-r1:0/1.0.0::gentoo  276 KiB
[ebuild  NS    ] app-text/docbook-xml-dtd-4.3-r2:4.3::gentoo [4.1.2-r7:4.1.2::gentoo, 4.2-r3:4.2::gentoo, 4.4-r3:4.4::gentoo, 4.5-r2:4.5::gentoo] 82 KiB
[ebuild  N     ] media-libs/jasper-4.2.4:0/7::gentoo  USE="jpeg opengl -doc -heif -test" 1941 KiB
[ebuild  N     ] media-libs/babl-0.1.128::gentoo  USE="-gtk-doc -introspection -lcms -vala" CPU_FLAGS_X86="avx2 f16c mmx sse sse2 sse4_1" 326 KiB
[ebuild  N     ] dev-libs/json-glib-1.10.8::gentoo  USE="nls -gtk-doc -introspection -test" 1264 KiB
[ebuild  N     ] x11-libs/gdk-pixbuf-2.44.8:2::gentoo  USE="gif jpeg tiff -gtk-doc -introspection -test" 5897 KiB
[ebuild  N     ] media-libs/gegl-0.4.70:0.4::gentoo  USE="cairo jpeg2k openmp tiff -debug -ffmpeg -gtk-doc -introspection -lcms -openexr -pdf -raw -sdl -sdl2 -svg -test -umfpack -v4l -vala -webp" 6020 KiB

Total: 8 packages (7 new, 1 in new slot), Size of downloads: 15842 KiB