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

Calculating dependencies ... done!
Dependency resolution took 1.15 s (backtrack: 0/20).

[ebuild  N     ] media-libs/libogg-1.3.6::gentoo  USE="-static-libs" 430 KiB
[ebuild  N     ] acct-group/apache-0-r3::gentoo  0 KiB
[ebuild  N     ] media-libs/libmad-0.15.1b-r10::gentoo  USE="-debug -static-libs" 491 KiB
[ebuild  N     ] media-libs/libmp4v2-2.1.3-r1::gentoo  USE="-utils" 581 KiB
[ebuild  N     ] dev-libs/apr-1.7.6-r1:1/1.7::gentoo  USE="urandom -doc -old-kernel (-selinux) -static-libs -valgrind" 879 KiB
[ebuild  N     ] media-libs/libid3tag-0.16.4:0/0.16.4::gentoo  48 KiB
[ebuild  N     ] media-libs/flac-1.5.0:0/11-14::gentoo  USE="cxx -debug -ogg -static-libs" CPU_FLAGS_X86="avx avx2" 1054 KiB
[ebuild  N     ] media-libs/libvorbis-1.3.7-r2::gentoo  USE="-static-libs -test" 1176 KiB
[ebuild  N     ] acct-user/apache-0-r4::gentoo  USE="-icingaweb2 -mgraph" 0 KiB
[ebuild  N     ] dev-libs/apr-util-1.6.5:1::gentoo  USE="gdbm openssl sqlite -berkdb -doc -ldap -mysql -nss -odbc -postgres -static-libs -verify-sig" 432 KiB
[ebuild  N     ] app-admin/apache-tools-2.4.69::gentoo  USE="ssl -verify-sig" 8314 KiB
[ebuild  N     ] www-servers/apache-2.4.69:2::gentoo  USE="filecaps gdbm ssl suexec-caps threads -debug -doc -ldap (-selinux) -static -suexec -suexec-syslog (-systemd) -verify-sig" APACHE2_MODULES="actions alias auth_basic authn_anon authn_core authn_dbm authn_file authz_core authz_dbm authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir env expires ext_filter file_cache filter headers http2 include info log_config logio mime mime_magic negotiation rewrite setenvif socache_shmcb speling status unique_id unixd userdir usertrack vhost_alias -access_compat -allowmethods -asis -auth_digest -auth_form -authn_dbd -authn_socache -authz_dbd -brotli -cache_disk -cache_socache -cern_meta -charset_lite -dbd -dumpio -ident -imagemap -lbmethod_bybusyness -lbmethod_byrequests -lbmethod_bytraffic -lbmethod_heartbeat -log_forensic (-lua) -macro -md -proxy -proxy_ajp -proxy_balancer -proxy_connect -proxy_fcgi -proxy_ftp -proxy_hcheck -proxy_html -proxy_http -proxy_http2 -proxy_scgi -proxy_uwsgi -proxy_wstunnel -ratelimit -remoteip -reqtimeout -request -session -session_cookie -session_crypto -session_dbd -slotmem_shm -socache_memcache -substitute -version -watchdog -xml2enc" APACHE2_MPMS="-event -prefork -worker" LUA_SINGLE_TARGET="lua5-1 -lua5-3 -lua5-4" 27 KiB
[ebuild  N     ] www-apache/mod_musicindex-1.4.1-r4::gentoo  USE="cache flac mp3 mp4 vorbis -archive -mysql" 502 KiB

Total: 13 packages (13 new), Size of downloads: 13930 KiB