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

Calculating dependencies ... done!
Dependency resolution took 1.72 s (backtrack: 0/20).

[ebuild  N     ] media-libs/giflib-6.1.3:0/7::gentoo  USE="-doc -static-libs" 460 KiB
[ebuild  N     ] acct-group/epam-0-r2::gentoo  0 KiB
[ebuild  N     ] acct-group/epmd-0-r3::gentoo  0 KiB
[ebuild  N     ] acct-group/ejabberd-0-r2::gentoo  0 KiB
[ebuild  N     ] acct-user/ejabberd-2-r1::gentoo  USE="pam" 0 KiB
[ebuild  N     ] acct-user/epmd-0-r3::gentoo  0 KiB
[ebuild  N     ] dev-lang/erlang-29.0:0/29.0::gentoo  USE="kpoll ssl -doc -java -odbc -sctp (-systemd) -tk -wxwidgets" 65437 KiB
[ebuild  N     ] media-libs/libwebp-1.6.0:0/7::gentoo  USE="gif jpeg opengl png tiff -static-libs -swap-16bit-csp" CPU_FLAGS_X86="avx2 sse2 sse4_1" 4196 KiB
[ebuild  N     ] dev-util/rebar-2.6.4-r1::gentoo  209 KiB
[ebuild  N     ] dev-util/rebar-3.27.0:3::gentoo  USE="-test" 810 KiB
[ebuild  N     ] dev-erlang/p1_utils-1.0.29::gentoo  48 KiB
[ebuild  N     ] dev-erlang/idna-7.1.0::gentoo  836 KiB
[ebuild  N     ] dev-erlang/jiffy-1.1.5::gentoo  1636 KiB
[ebuild  N     ] dev-erlang/jose-1.11.12::gentoo  304 KiB
[ebuild  N     ] dev-erlang/p1_oauth2-0.6.14::gentoo  USE="-test" 19 KiB
[ebuild  N     ] dev-erlang/pkix-1.0.10::gentoo  393 KiB
[ebuild  N     ] dev-erlang/epam-1.0.14::gentoo  49 KiB
[ebuild  N     ] dev-erlang/sqlite3-1.1.15::gentoo  1676 KiB
[ebuild  N     ] dev-erlang/base64url-1.0.1-r1::gentoo  3 KiB
[ebuild  N     ] dev-erlang/fast_tls-1.1.26::gentoo  85 KiB
[ebuild  N     ] dev-erlang/fast_xml-1.1.60::gentoo  105 KiB
[ebuild  N     ] dev-erlang/fast_yaml-1.0.40::gentoo  60 KiB
[ebuild  N     ] dev-erlang/stringprep-1.0.34::gentoo  98 KiB
[ebuild  N     ] dev-erlang/ezlib-1.0.16::gentoo  49 KiB
[ebuild  N     ] dev-erlang/cache_tab-1.0.34::gentoo  60 KiB
[ebuild  N     ] dev-erlang/mqtree-1.0.20::gentoo  260 KiB
[ebuild  N     ] dev-erlang/yconf-1.0.23::gentoo  220 KiB
[ebuild  N     ] dev-erlang/xmpp-1.13.4::gentoo  632 KiB
[ebuild  N     ] dev-erlang/stun-1.2.22::gentoo  42 KiB
[ebuild  N     ] dev-erlang/p1_acme-1.0.31::gentoo  216 KiB
[ebuild   R    ] media-libs/gd-2.3.3-r4:2/3::gentoo  USE="fontconfig jpeg png tiff truetype webp* zlib -avif -heif -static-libs -test -xpm" CPU_FLAGS_X86="sse" 2744 KiB
[ebuild  N     ] dev-erlang/eimp-1.0.27::gentoo  3394 KiB
[ebuild  N     ] net-im/ejabberd-26.04::gentoo  USE="pam sqlite stun zlib -captcha -debug -full-xml -ldap -mssql -mysql -odbc -postgres -redis -roster-gw (-selinux) -sip" 2868 KiB

Total: 33 packages (32 new, 1 reinstall), Size of downloads: 86895 KiB

The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by dev-erlang/eimp-1.0.27::gentoo
# required by net-im/ejabberd-26.04::gentoo
# required by =net-im/ejabberd-26.04 (argument)
>=media-libs/gd-2.3.3-r4 webp