I think you might need to run this comand:
sudo ln -s /usr/src/vero364-headers-$(uname -r) /lib/modules/$(uname -r)/build
That said, I can’t get it to compile in the standard (armhf) environment, probably because it’s building for an aarch64 kernel. You might need to use the aarch64-toolchain-osmc package. The error I see is:
osmc@osmc-4k:~/media_build$ make -j4
make -C /home/osmc/media_build/v4l
make[1]: Entering directory '/home/osmc/media_build/v4l'
make -C firmware prep
creating symbolic links...
make[2]: Entering directory '/home/osmc/media_build/v4l/firmware'
make[2]: Nothing to be done for 'prep'.
make[2]: Leaving directory '/home/osmc/media_build/v4l/firmware'
make -C firmware
make[2]: Entering directory '/home/osmc/media_build/v4l/firmware'
make[2]: Nothing to be done for 'default'.
make[2]: Leaving directory '/home/osmc/media_build/v4l/firmware'
Kernel build directory is /lib/modules/3.14.29-160-osmc/build
make -C ../linux apply_patches
make[2]: Entering directory '/home/osmc/media_build/linux'
Patches for 3.14.29-160-osmc already applied.
make[2]: Leaving directory '/home/osmc/media_build/linux'
make -C /lib/modules/3.14.29-160-osmc/build M=/home/osmc/media_build/v4l modules
make[2]: Entering directory '/usr/src/vero364-headers-3.14.29-160-osmc'
gcc: error: unrecognized command line option '-mstrict-align'; did you mean '-Wstrict-aliasing'?
KBUILD_CFLAGS_MODULE:-DMODULE
CC [M] /home/osmc/media_build/v4l/altera-lpt.o
gcc: error: unrecognized command line option '-mstrict-align'; did you mean '-Wstrict-aliasing'?
CC [M] /home/osmc/media_build/v4l/altera-jtag.o
gcc: error: unrecognized command line option '-mgeneral-regs-only'
gcc: error: unrecognized command line option '-mstrict-align'; did you mean '-Wstrict-aliasing'?
make[3]: *** [scripts/Makefile.build:308: /home/osmc/media_build/v4l/altera-lpt.o] Error 1
make[3]: *** Waiting for unfinished jobs....
gcc: error: unrecognized command line option '-mgeneral-regs-only'
make[3]: *** [scripts/Makefile.build:308: /home/osmc/media_build/v4l/altera-jtag.o] Error 1
make[2]: *** [Makefile:1291: _module_/home/osmc/media_build/v4l] Error 2
make[2]: Leaving directory '/usr/src/vero364-headers-3.14.29-160-osmc'
make[1]: *** [Makefile:53: default] Error 2
make[1]: Leaving directory '/home/osmc/media_build/v4l'
make: *** [Makefile:26: all] Error 2
Unfortunately, I’ll not have a lot of free time today or tomorrow to investigate further.