ap-daemons failed to build on first attempt, and was retried, in https://luci-milo.appspot.com/buildbot/chromiumos.tryserver/no_vmtest_pre_cq/72483

ap-daemons-0.0.3-r3008: /build/whirlwind/usr/share/proto: warning: directory does not exist.
ap-daemons-0.0.3-r3008: 
ap-daemons-0.0.3-r3008: [11/288] ACTION Generating DBus proxies C++ headers from ../ap/wireless/wifiblaster/dbus_bindings/org.chromium.ap.Wifiblaster.xml
ap-daemons-0.0.3-r3008: [12/288] ACTION Generating DBus proxies C++ headers from ../ap/wireless/wifiblaster/dbus_bindings/org.chromium.ap.Wifiblaster.xml
ap-daemons-0.0.3-r3008: [12/288] CXX platform/ap-daemons/diagnostics/resource-monitor.resource_monitor.o
ap-daemons-0.0.3-r3008: [13/288] CXX platform/ap-daemons/controller/tools/psk-generator.psk_generator.o
ap-daemons-0.0.3-r3008: [13/288] AR platform/ap-daemons/libpsk-generator.a
ap-daemons-0.0.3-r3008: [14/288] AR platform/ap-daemons/libpsk-generator.a
ap-daemons-0.0.3-r3008: [14/288] RULE Generating C++ code from fcm/mcs.proto
ap-daemons-0.0.3-r3008: [15/288] RULE Generating C++ code from fcm/mcs.proto
ap-daemons-0.0.3-r3008: /build/whirlwind/usr/share/proto: warning: directory does not exist.
ap-daemons-0.0.3-r3008: 
ap-daemons-0.0.3-r3008: [15/288] RULE Generating C++ code from fcm/android_checkin.proto
ap-daemons-0.0.3-r3008: [16/288] RULE Generating C++ code from fcm/android_checkin.proto
ap-daemons-0.0.3-r3008: /build/whirlwind/usr/share/proto: warning: directory does not exist.
ap-daemons-0.0.3-r3008: 
ap-daemons-0.0.3-r3008: [16/288] STAMP platform/ap-daemons/mcs_proto.actions_rules_copies.stamp
ap-daemons-0.0.3-r3008: [17/288] STAMP platform/ap-daemons/mcs_proto.actions_rules_copies.stamp
ap-daemons-0.0.3-r3008: [17/288] CXX platform/ap-daemons/gen/ap-daemons/fcm/mcs_proto.android_checkin.pb.o
ap-daemons-0.0.3-r3008: [18/288] CXX platform/ap-daemons/common/web-server-proxy.register_callback_interface.o
ap-daemons-0.0.3-r3008: [18/288] CXX platform/ap-daemons/gen/ap-daemons/fcm/mcs_proto.checkin.pb.o
ap-daemons-0.0.3-r3008: [19/288] CXX platform/ap-daemons/common/mdns-parser.mdns_parser.o
ap-daemons-0.0.3-r3008: [19/288] AR platform/ap-daemons/libmdns-parser.a
ap-daemons-0.0.3-r3008: [20/288] AR platform/ap-daemons/libmdns-parser.a
ap-daemons-0.0.3-r3008: [20/288] CXX platform/ap-daemons/gen/ap-daemons/fcm/mcs_proto.mcs.pb.o
ap-daemons-0.0.3-r3008: [21/288] CXX platform/ap-daemons/common/libipv6mtumonitor.ipv6_upstream_mtu_monitor.o
ap-daemons-0.0.3-r3008: FAILED: platform/ap-daemons/common/libipv6mtumonitor.ipv6_upstream_mtu_monitor.o 
ap-daemons-0.0.3-r3008: armv7a-cros-linux-gnueabi-clang++ -MMD -MF platform/ap-daemons/common/libipv6mtumonitor.ipv6_upstream_mtu_monitor.o.d -DUSE_METRICS_UPLOADER=1 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Iplatform/ap-daemons/libipv6mtumonitor.gen/include -Igen/include -I/build/whirlwind/tmp/portage/chromeos-base/ap-daemons-0.0.3-r3008/work/ap-daemons-0.0.3/platform2 -I/build/whirlwind/tmp/portage/chromeos-base/ap-daemons-0.0.3-r3008/work/ap-daemons-0.0.3/platform -I/build/whirlwind/usr/include -Wall -Wno-psabi -Wunused -Wno-unused-parameter -ggdb3 -fstack-protector-strong -Wformat=2 -fvisibility=internal -Wa,--noexecstack -Werror --sysroot=/build/whirlwind -pthread -std=c++11 -pthread -DUSE_RTTI_FOR_TYPE_TAGS -Wno-c++11-extensions -Wno-unused-local-typedefs -DBASE_VER=395517 -pthread -I/build/whirlwind/usr/include/shill-client -I/build/whirlwind/usr/include/power_manager-client -I/build/whirlwind/usr/include/base-395517 -I/build/whirlwind/usr/include/glib-2.0 -I/build/whirlwind/usr/lib/glib-2.0/include -I/build/whirlwind/usr/include/nss -I/build/whirlwind/usr/include/nspr -I/build/whirlwind/usr/include/dbus-1.0 -I/build/whirlwind/usr/lib/dbus-1.0/include -I/build/whirlwind/usr/include/chromeos -fPIE -std=gnu++11 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -O2 -O2 -O2 -pipe -march=armv7-a -mfpu=vfpv3-d16 -mfloat-abi=hard -g -fno-exceptions -fno-unwind-tables -fno-asynchronous-unwind-tables -clang-syntax -clang-syntax -fno-exceptions -fno-unwind-tables -fno-asynchronous-unwind-tables  -c ../../../../../../../tmp/portage/chromeos-base/ap-daemons-0.0.3-r3008/work/ap-daemons-0.0.3/platform/ap-daemons/common/ipv6_upstream_mtu_monitor.cc -o platform/ap-daemons/common/libipv6mtumonitor.ipv6_upstream_mtu_monitor.o
ap-daemons-0.0.3-r3008: In file included from ../../../../../../../tmp/portage/chromeos-base/ap-daemons-0.0.3-r3008/work/ap-daemons-0.0.3/platform/ap-daemons/common/ipv6_upstream_mtu_monitor.cc:5:
ap-daemons-0.0.3-r3008: In file included from /build/whirlwind/tmp/portage/chromeos-base/ap-daemons-0.0.3-r3008/work/ap-daemons-0.0.3/platform/ap-daemons/common/ipv6_upstream_mtu_monitor.h:19:
ap-daemons-0.0.3-r3008: In file included from /build/whirlwind/tmp/portage/chromeos-base/ap-daemons-0.0.3-r3008/work/ap-daemons-0.0.3/platform/ap-daemons/common/wan_configuration.h:8:
ap-daemons-0.0.3-r3008: /build/whirlwind/tmp/portage/chromeos-base/ap-daemons-0.0.3-r3008/work/ap-daemons-0.0.3/platform/ap/common/configuration_monitor.h:13:10: fatal error: 'ap-daemons/controller/dbus-proxies.h' file not found
ap-daemons-0.0.3-r3008: #include "ap-daemons/controller/dbus-proxies.h"
ap-daemons-0.0.3-r3008:          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ap-daemons-0.0.3-r3008: 1 error generated.
ap-daemons-0.0.3-r3008: 
[snip]
WARNING: The following packages failed once or more,
but succeeded upon retry. This might indicate incorrect
dependencies.
  chromeos-base/ap-daemons-0.0.3-r3008



This likely indicates a missing package dependency, which is causing this package to need to get retried, wasting build time.

Assigning to non-pacific sheriff to track down and fix by adding necessary dependency.