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

Calculating dependencies ... done!
Dependency resolution took 1.38 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/oniguruma-6.9.10:0/5::gentoo  USE="-crnl-as-line-terminator -static-libs" 957 KiB
[ebuild  N     ] dev-build/b2-5.5.3::gentoo  USE="-examples" 1198 KiB
[ebuild  N     ] acct-group/icingacmd-0-r3::gentoo  0 KiB
[ebuild  N     ] app-eselect/eselect-php-0.9.9::gentoo  USE="-apache2 -fpm" 54 KiB
[ebuild  N     ] acct-group/icinga-0-r3::gentoo  0 KiB
[ebuild  N     ] acct-group/nagios-0-r3::gentoo  0 KiB
[ebuild  N     ] acct-group/icingaweb2-0-r3::gentoo  0 KiB
[ebuild  N     ] net-libs/c-client-2007f_p7-r1::gentoo  USE="ipv6 pam ssl -doc -kerberos -static-libs -topal" 2772 KiB
[ebuild  N     ] dev-libs/yajl-2.1.0-r6:0/2::gentoo  83 KiB
[ebuild  N     ] app-arch/lz4-1.10.0-r1:0/1.10.0-meson::gentoo  USE="-static-libs -test" 379 KiB
[ebuild  N     ] dev-lang/php-8.3.35:8.3::gentoo  USE="acl bzip2 cli ctype curl fileinfo filter flatfile gd gdbm gmp iconv imap intl ipv6 jit jpeg nls opcache opcache-jit pdo phar png posix readline session simplexml sockets sqlite ssl threads tokenizer truetype unicode xml xslt zlib -apache2 -apparmor -argon2 -avif -bcmath -berkdb -calendar -capstone -cdb -cgi -debug -embed -enchant -exif -ffi -fpm -ftp -inifile -iodbc -kerberos -ldap -ldap-sasl -libedit -lmdb -mhash -mssql -mysql -mysqli -odbc -pcntl -phpdbg -postgres -qdbm (-selinux) -session-mm -sharedmem -snmp -soap -sodium -spell (-systemd) -sysvipc -test -tidy -tokyocabinet -valgrind -webp -xmlreader -xmlwriter -xpm -zip" POSTGRES_TARGETS="postgres17 -postgres15 -postgres16 -postgres18" 12328 KiB
[ebuild  N     ] dev-libs/uriparser-1.0.2::gentoo  USE="unicode -doc -qt6 -test" 218 KiB
[ebuild  N     ] media-gfx/imagemagick-7.1.2.32:0/7.1.2-18::gentoo  USE="X bzip2 cxx fontconfig jpeg jpeg2k openmp png tiff truetype zlib -corefonts -djvu -fftw -fpx -graphviz -hardened -hdri -heif -jbig -jpegxl -lcms -lqr -lzma -opencl -openexr -pango -perl -postscript -q8 -q32 -raw -static-libs -svg -test -verify-sig -webp -wmf -xml -zip" PERL_FEATURES="ithreads (-debug) -quadmath" 9939 KiB
[ebuild  N     ] dev-libs/boost-1.91.0-r2:0/1.91.0::gentoo  USE="bzip2 context nls python stacktrace zlib -debug -doc -icu -lzma -mpi -numpy -test -test-full -tools -zstd" PYTHON_TARGETS="python3_14 -python3_12 -python3_13" 199785 KiB
[ebuild  N     ] dev-db/mysql-connector-c-8.0.41-r1:0/21::gentoo  USE="-ldap -static-libs" 477295 KiB
[ebuild  N     ] acct-user/icinga-0-r3::gentoo  0 KiB
[ebuild  N     ] net-analyzer/monitoring-plugins-3.0.3::gentoo  USE="filecaps ipv6 ssh -curl -dns -fping -game -ldap -mysql -postgres -radius -rpc -samba -snmp -suid" 2937 KiB
[ebuild  N     ] net-analyzer/icinga2-2.16.5::gentoo  USE="mysql plugins -console -jumbo-build -mail -mariadb -minimal -opentelemetry -postgres (-systemd) -test" 9363 KiB
[ebuild  N     ] dev-lang/php-8.5.11:8.5::gentoo  USE="acl bzip2 cli ctype fileinfo filter flatfile gdbm gmp iconv ipv6 jit jpeg nls opcache-jit phar png posix readline session simplexml sqlite ssl threads tokenizer truetype unicode xml zlib -apache2 -apparmor -argon2 -avif -bcmath -berkdb -calendar -capstone -cdb -cgi -curl -debug -embed -enchant -exif -ffi -fpm -ftp -gd -inifile -intl -iodbc -ldap -ldap-sasl -libedit -lmdb -mhash -mssql -mysql -mysqli -odbc -pcntl -pdo -phpdbg -postgres -qdbm (-selinux) -session-mm -sharedmem -snmp -soap -sockets -sodium -spell (-systemd) -sysvipc -test -test-full -tidy -tokyocabinet -valgrind -webp -xmlreader -xmlwriter -xpm -xslt -zip" POSTGRES_TARGETS="postgres17 -postgres15 -postgres16 -postgres18" 14131 KiB
[ebuild  N     ] dev-php/pecl-imagick-3.8.1::gentoo  USE="-examples -test" PHP_TARGETS="php8-3 -php8-2 -php8-4 -php8-5" 356 KiB
[ebuild  N     ] dev-libs/icinga-php-library-0.17.0::gentoo  3289 KiB
[ebuild  N     ] dev-libs/icinga-php-thirdparty-0.15.3::gentoo  11058 KiB
[ebuild  N     ] www-apps/icingaweb2-2.12.5::gentoo  USE="-apache2 -apache2-server -fpm -ldap -mysql -nginx -pdf -postgres" 6216 KiB
[ebuild  N     ] www-apps/icingaweb2-module-graphite-1.2.1::gentoo  338 KiB

Total: 24 packages (24 new), Size of downloads: 752686 KiB

The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by www-apps/icingaweb2-2.12.5::gentoo
# required by www-apps/icingaweb2-module-graphite-1.2.1::gentoo
# required by =www-apps/icingaweb2-module-graphite-1.2.1 (argument)
>=dev-lang/php-8.3.35:8.3 intl curl sockets xslt pdo gd

 * In order to avoid wasting time, backtracking has terminated early
 * due to the above autounmask change(s). The --autounmask-backtrack=y
 * option can be used to force further backtracking, but there is no
 * guarantee that it will produce a solution.