[OE-core] Kernel headers in SDK

[Nemicolopterus Crypticus]

Hi all,

I need the kernel headers to show up in my SDK.

I'm running

$ bitbake <image name> -c populate_sdk

I've tried both of these, separately and together:
IMAGE_INSTALL += "kernel-devsrc"
TOOLCHAIN_TARGET_TASK_append = " kernel-devsrc"

It always fails with this:
|
/local/mnt/workspace2/mollyn/platform/1aug/poky/build/tmp/work/qcom_bsp-poky-linux/kernel-devsrc/1.0-r0/image/usr/src/kernel/arch/arm64/boot/Makefile:17:
/local/mnt/workspace2/mollyn/platform/1aug/poky/build/tmp/work/custom_bsp-poky-linux/kernel-devsrc/1.0-r0/image/usr/src/kernel/arch/arm64/boot/dts/qcom/Makefile:
No such file or directory
| make[2]: *** No rule to make target
`/local/mnt/workspace2/mollyn/platform/1aug/poky/build/tmp/work/custom_bsp-poky-linux/kernel-devsrc/1.0-r0/image/usr/src/kernel/arch/arm64/boot/dts/qcom/Makefile'.
Stop.

The virtual kernel is set like this in the machine conf file:
PREFERRED_PROVIDER_virtual/kernel = "linux-msm"

It's the exact issue described here:
https://lists.yoctoproject.org/pipermail/yocto/2015-July/025453.html

But the fix doesn't work for me.
Is there something we need to add to our kernel?
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