/home/android/android/pixel90/out/soong/.bootstrap/bin/soong_build -t -l /home/android/android/pixel90/out/.module_paths/Android.bp.list -b /home/android/android/pixel90/out/soong -n /home/android/android/pixel90/out -d /home/android/android/pixel90/out/soong/build.ninja.d -o /home/android/android/pixel90/out/soong/build.ninja Android.bp
error: vendor/aosp/build/soong/Android.bp:31:8: module "generated_kernel_includes": cmd: unknown variable '$(KERNEL_MAKE_FLAGS)'
ninja: build stopped: subcommand failed.
09:11:09 soong bootstrap failed with: exit status 1
android@builduntuvm:~/android/pixel90$