Cannot build kernel module on 6.6.47-current-rockchip

[Lorenzo Gentile]

I am trying to build a kernel module on latest tinkerboard Armbian release:
 

uname -a
Linux tinkerboard 6.6.47-current-rockchip #2 SMP Mon Aug 19 04:04:32 UTC 2024 armv7l GNU/Linux

The kernel module in question is Open Source Mali Midgard GPU Kernel Driver, downloaded from ARM.
I installed kernel headers through armbian-config:
 

ls /usr/src/linux-headers-6.6.47-current-rockchip
arch   certs   Documentation  fs       init      ipc      kernel  Makefile  Module.symvers  rust     scripts   sound  usr
block  crypto  drivers        include  io_uring  Kconfig  lib     mm        net             samples  security  tools  virt

When I run make with verbose option inside the module source directory, I get the following output:

make V=1
make -C /lib/modules/6.6.47-current-rockchip/build M=/home/loregen/libs-from-source/TX041-SW-99002-r26p0-01rel0/driver/product/kernel/drivers/gpu/arm/midgard EXTRA_CFLAGS="-I/home/loregen/libs-from-source/TX041-SW-99002-r26p0-01rel0/driver/product/kernel/drivers/gpu/arm/midgard/../../../../include -I/home/loregen/libs-from-source/TX041-SW-99002-r26p0-01rel0/driver/product/kernel/drivers/gpu/arm/midgard/../../../../tests/include "  KBUILD_EXTRA_SYMBOLS="" modules
make[1]: Entering directory '/usr/src/linux-headers-6.6.47-current-rockchip'
make --no-print-directory -C /usr/src/linux-headers-6.6.47-current-rockchip \
-f /usr/src/linux-headers-6.6.47-current-rockchip/Makefile modules
make -f ./scripts/Makefile.build obj=/home/loregen/libs-from-source/TX041-SW-99002-r26p0-01rel0/driver/product/kernel/drivers/gpu/arm/midgard need-builtin=1 need-modorder=1
# cmd_modules_order /home/loregen/libs-from-source/TX041-SW-99002-r26p0-01rel0/driver/product/kernel/drivers/gpu/arm/midgard/modules.order
  {  :; } > /home/loregen/libs-from-source/TX041-SW-99002-r26p0-01rel0/driver/product/kernel/drivers/gpu/arm/midgard/modules.order
sh ./scripts/modules-check.sh /home/loregen/libs-from-source/TX041-SW-99002-r26p0-01rel0/driver/product/kernel/drivers/gpu/arm/midgard/modules.order
make -f ./scripts/Makefile.modpost
# MODPOST /home/loregen/libs-from-source/TX041-SW-99002-r26p0-01rel0/driver/product/kernel/drivers/gpu/arm/midgard/Module.symvers
   scripts/mod/modpost -M        -o /home/loregen/libs-from-source/TX041-SW-99002-r26p0-01rel0/driver/product/kernel/drivers/gpu/arm/midgard/Module.symvers -T /home/loregen/libs-from-source/TX041-SW-99002-r26p0-01rel0/driver/product/kernel/drivers/gpu/arm/midgard/modules.order -i Module.symvers -e
make -f ./scripts/Makefile.modfinal
make[1]: Leaving directory '/usr/src/linux-headers-6.6.47-current-rockchip'

I cannot figure out why the module doesn't build.