Mender - Tinkerboard - Python.h

So when I run it with the Dunfell Branches I run into the Python.h error (which is why I started the thread)

ALL ON DUNFELL:

BBLAYERS ?= " \
  /sources/poky/meta \
  /sources/poky/meta-poky \
  /sources/poky/meta-yocto-bsp \
  /sources/meta-mender/meta-mender-core \
  /sources/meta-openembedded/meta-oe \
  /sources/meta-rockchip \

I set it up again and only with local.conf changes: (only this!)
and bbappend adapted

MACHINE = "tinker-board-s"
MENDER_ARTIFACT_NAME = "release-1"
INHERIT += "mender-full"
MENDER_FEATURES_ENABLE_append = " mender-uboot mender-image-sd"
MENDER_FEATURES_DISABLE_append = " mender-grub mender-image-uefi"

The second case, occurred only because I tried Asus Tinker Board
And the grub-errors appear there. Here also only the changes in local.conf as above.

Thanks!