karnak build on 17.1 branch build fails

[pessimism]

Followed build instructions here: https://github.com/mt8163/android_vendor_amazon_mt8163/blob/lineage-17.1/README.md using Ubuntu 20.04.1

Build fails with the following error:

~/android/lineage$ brunch lineage_karnak-userdebug
Trying dependencies-only mode on a non-existing device tree?

============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=10
LINEAGE_VERSION=17.1-20201005-UNOFFICIAL-karnak
TARGET_PRODUCT=lineage_karnak
TARGET_BUILD_VARIANT=userdebug
TARGET_BUILD_TYPE=release
TARGET_ARCH=arm
TARGET_ARCH_VARIANT=armv7-a-neon
TARGET_CPU_VARIANT=cortex-a7
HOST_ARCH=x86_64
HOST_2ND_ARCH=x86
HOST_OS=linux
HOST_OS_EXTRA=Linux-5.4.0-48-generic-x86_64-Ubuntu-20.04.1-LTS
HOST_CROSS_OS=windows
HOST_CROSS_ARCH=x86
HOST_CROSS_2ND_ARCH=x86_64
HOST_BUILD_TYPE=release
BUILD_ID=QQ3A.200805.001
OUT_DIR=out
============================================
============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=10
LINEAGE_VERSION=17.1-20201005-UNOFFICIAL-karnak
TARGET_PRODUCT=lineage_karnak
TARGET_BUILD_VARIANT=userdebug
TARGET_BUILD_TYPE=release
TARGET_ARCH=arm
TARGET_ARCH_VARIANT=armv7-a-neon
TARGET_CPU_VARIANT=cortex-a7
HOST_ARCH=x86_64
HOST_2ND_ARCH=x86
HOST_OS=linux
HOST_OS_EXTRA=Linux-5.4.0-48-generic-x86_64-Ubuntu-20.04.1-LTS
HOST_CROSS_OS=windows
HOST_CROSS_ARCH=x86
HOST_CROSS_2ND_ARCH=x86_64
HOST_BUILD_TYPE=release
BUILD_ID=QQ3A.200805.001
OUT_DIR=out
============================================
[100% 140/140] out/soong/.bootstrap/bin/soong_build out/soong/build.ninja
FAILED: out/soong/build.ninja
out/soong/.bootstrap/bin/soong_build -t -l out/.module_paths/Android.bp.list -b                                                                                             out/soong -n out -d out/soong/build.ninja.d -globFile out/soong/.bootstrap/build                                                                                            -globs.ninja -o out/soong/build.ninja Android.bp
error: frameworks/av/media/libstagefright/Android.bp:116:1: dependency "libdpframework" of "libstagefright" missing variant:
  arch:android_arm_armv7-a-neon_cortex-a7, image:core, link:shared, version:
available variants:
  arch:android_arm_armv7-a-neon_cortex-a7, image:vendor, link:shared, version:
  arch:android_arm_armv7-a-neon_cortex-a7, image:vendor, link:static, version:
07:33:59 soong bootstrap failed with: exit status 1

I found a posting referencing a similar error suggesting something isn't quite right with the file structure:
https://community.nxp.com/t5/i-MX-Processors/Android-8-0-0-Oreo-Build-Issue/m-p/809633