Please refer to the email thread starting with https://lists.freebsd.org/archives/freebsd-ports/2023-September/004433.html

From the poudriere build log on my build machine, running:
FreeBSD 12.4-STABLE #256 stable/12-n236282-b083794291d2: Wed Sep 27 10:26:39 UTC 2023     root@freebeast.catwhisker.org:/common/S1/obj/usr/src/amd64.amd64/sys/GENERIC  amd64 1204500 1204500

with the ports tree at main-n634807-080478034ac8:

FAILED: obj/net/dns/dns/address_info.o
c++ -MMD -MF obj/net/dns/dns/address_info.o.d -DUSE_AURA=1 -DUSE_GLIB=1 -DUSE_OZONE=1 -DOFFICIAL_BUILD -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D_FORTIFY_SOURCE=2 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -DNO_UNWIND_TABLES -D_GNU_SOURCE -DNDEBUG -DNVALGRIND -DDYNAMIC_ANNOTATIONS_ENABLED=0 -DGLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_56 -DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_56 -DBASE_USE_PERFETTO_CLIENT_LIBRARY=1 -DGOOGLE_PROTOBUF_NO_RTTI -DGOOGLE_PROTOBUF_NO_STATIC_INITIALIZER -DGOOGLE_PROTOBUF_INTERNAL_DONATE_STEAL_INLINE=0 -DHAVE_PTHREAD -DUSE_SYSTEM_LIBEVENT=1 -DNET_IMPLEMENTATION -DENABLE_BUILT_IN_DNS -DUSE_GIO -DUSING_SYSTEM_ICU=1 -DICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_STATIC -DU_FINAL=final -DU_NOEXCEPT=noexcept -DU_OVERRIDE=override -DU_IMPORT=U_EXPORT -I../.. -Igen -I../../third_party/perfetto/include -Igen/third_party/perfetto/build_config -Igen/third_party/perfetto -Igen/shim_headers/libevent_shim -Igen/shim_headers/icui18n_shim -Igen/shim_headers/icuuc_shim -I../../net/third_party/quiche/overrides -I../../net/third_party/quiche/src/quiche/common/platform/default -I../../net/third_party/quiche/src -I../../third_party/protobuf/src -Igen/protoc_out -I../../third_party/abseil-cpp -I../../third_party/boringssl/src/include -Igen/net/third_party/quiche/src -I../../third_party/zlib -I../../third_party/ced/src -I../../third_party/brotli/include -Wall -Wextra -Wimplicit-fallthrough -Wextra-semi -Wunreachable-code-aggressive -Wthread-safety -Wno-missing-field-initializers -Wno-unused-parameter -Wno-psabi -Wloop-analysis -Wno-unneeded-internal-declaration -Wenum-compare-conditional -Wno-ignored-pragma-optimize -Wshadow -fno-delete-null-pointer-checks -fno-ident -fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector -fno-unwind-tables -fno-asynchronous-unwind-tables -fPIC -pthread -fcolor-diagnostics -fmerge-all-constants -m64 -msse3 -Xclang -fdebug-compilation-dir -Xclang . -no-canonical-prefixes -ftrivial-auto-var-init=pattern -O2 -fdata-sections -ffunction-sections -fno-unique-section-names -fno-omit-frame-pointer -g0 -fprofile-use=../../chrome/build/pgo_profiles/chrome-linux-5938-1694193273-92041abba5ed60196170382dbce223833adce5c9.profdata -Wno-profile-instr-unprofiled -Wno-profile-instr-out-of-date -Wno-backend-plugin -fvisibility=hidden -Wheader-hygiene -Wstring-conversion -Wtautological-overlap-compare -I/usr/local/include -I/usr/local/include/glib-2.0 -I/usr/local/lib/glib-2.0/include -DPROTOBUF_ALLOW_DEPRECATED=1 -Wexit-time-destructors -I/usr/local/include -I/usr/local/include/glib-2.0 -I/usr/local/lib/glib-2.0/include -I/usr/local/include -I/usr/local/include -std=c++20 -Wno-trigraphs -fno-exceptions -fno-rtti -fvisibility-inlines-hidden -O2 -pipe -fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing  -isystem /usr/local/include  -c ../../net/dns/address_info.cc -o obj/net/dns/dns/address_info.o
../../net/dns/address_info.cc:81:47: error: use of undeclared identifier 'EAI_NODATA'
    if (os_error != EAI_NONAME && os_error != EAI_NODATA)
                                              ^
1 error generated.


As noted in the cited email message, this does not occur in 13 because of:
commit 870d2ff3052822dd6b46f2c07c442926d637130b
Author: Mike Karels <karels@FreeBSD.org>
Date:   Wed Nov 2 10:43:04 2022 -0500

    netdb.h: re-enable EAI_ADDRFAMILY, EAI_NODATA

    EAI_ADDRFAMILY and EAI_NODATA are not in RFC 3493, but are available
    and used in many other systems.  It is desirable to have at least one
    of them in order to distinguish between names that do not resolve and
    those that do not have the requested address type.  A change to
    getaddrinfo() will use EAI_ADDRFAMILY.  Both were "#if 0"; re-enable,
    conditioned on __BSD_VISIBLE, and update comments.  Also add comments
    and __BSD_VISIBLE conditional for the last three EAI errors, which
    are not in the RFC or POSIX.  Note, all of these are available in
    NetBSD and OpenBSD, and EAI_ADDRFAMILY and EAI_NODATA are available
    in Linux (glibc).

    Reviewed in https://reviews.freebsd.org/D37139 with related changes.

    Reviewed by:    bz

    (cherry picked from commit 40e4e12bd84154626d5b46c3e862c79da25bc403)