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Building Fairphone Open OS fails without setting USE_CUSTOM_AUDIO_POLICY

I exactly followed the build instructions on https://code.fairphone.com/projects/fp-osos/dev/fairphone-os-build-instructions.html but I am always getting the following result:

[...]
Notice file: frameworks/base/cmds/media/NOTICE -- out/target/product/FP2/obj/NOTICE_FILES/src//system/bin/media.txt
Export includes file: frameworks/av/services/audioflinger/Android.mk -- out/target/product/FP2/obj/SHARED_LIBRARIES/libaudioflinger_intermediates/export_includes
Export includes file: frameworks/av/services/audiopolicy/Android.mk -- out/target/product/FP2/obj/SHARED_LIBRARIES/libaudiopolicyservice_intermediates/export_includes
Export includes file: frameworks/av/services/camera/libcameraservice/Android.mk -- out/target/product/FP2/obj/SHARED_LIBRARIES/libcameraservice_intermediates/export_includes
Export includes file: frameworks/av/services/medialog/Android.mk -- out/target/product/FP2/obj/SHARED_LIBRARIES/libmedialogservice_intermediates/export_includes
Export includes file: frameworks/av/media/libmediaplayerservice/Android.mk -- out/target/product/FP2/obj/SHARED_LIBRARIES/libmediaplayerservice_intermediates/export_includes
Export includes file: frameworks/av/services/soundtrigger/Android.mk -- out/target/product/FP2/obj/SHARED_LIBRARIES/libsoundtriggerservice_intermediates/export_includes
Export includes file: frameworks/av/media/mediaserver/Android.mk -- out/target/product/FP2/obj/STATIC_LIBRARIES/libregistermsext_intermediates/export_includes
Export includes file: frameworks/av/services/audioflinger/Android.mk -- out/target/product/FP2/obj/SHARED_LIBRARIES/libaudioresampler_intermediates/export_includes
Export includes file: frameworks/av/media/libeffects/factory/Android.mk -- out/target/product/FP2/obj/SHARED_LIBRARIES/libeffects_intermediates/export_includes
Export includes file: frameworks/av/services/audioflinger/Android.mk -- out/target/product/FP2/obj/SHARED_LIBRARIES/libserviceutility_intermediates/export_includes
Export includes file: frameworks/av/services/audioflinger/Android.mk -- out/target/product/FP2/obj/STATIC_LIBRARIES/libscheduling_policy_intermediates/export_includes
Export includes file: frameworks/av/media/libcpustats/Android.mk -- out/target/product/FP2/obj/STATIC_LIBRARIES/libcpustats_intermediates/export_includes
Import includes file: out/target/product/FP2/obj/SHARED_LIBRARIES/libaudioresampler_intermediates/import_includes
Import includes file: out/target/product/FP2/obj/SHARED_LIBRARIES/libeffects_intermediates/import_includes
Import includes file: out/target/product/FP2/obj/SHARED_LIBRARIES/libserviceutility_intermediates/import_includes
Import includes file: out/target/product/FP2/obj/STATIC_LIBRARIES/libscheduling_policy_intermediates/import_includes
make: *** No rule to make target `out/target/product/FP2/obj/SHARED_LIBRARIES/libaudiopolicymanager_intermediates/export_includes', needed by `out/target/product/FP2/obj/SHARED_LIBRARIES/libaudiopolicyservice_intermediates/import_includes'.  Stop.
make: *** Waiting for unfinished jobs....
Import includes file: out/target/product/FP2/obj/STATIC_LIBRARIES/libcpustats_intermediates/import_includes

This also happens when building from a clean docker image like https://github.com/justfortherec/fairphone2-build-env/ and also with make -j1.

As per this Stackoverflow post I can make the build succeed by setting USE_CUSTOM_AUDIO_POLICY to 0:

echo "USE_CUSTOM_AUDIO_POLICY := 0" >> device/fairphone_devices/FP2/BoardConfig.mk

I am not sure though, if the build is fully functional then.

Anyone knows why the build fails and how to fix it without modifying BoardConfig.mk?

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