synology-wireguard: DSM 7.0 41882 compile failed

Hi guys, DSM Ver 7.0 41882 (DS1019+) tried to compile using matiges instructions (refer pull request #71). Did not compile. See putty output:

root@NAS:/etc/synology-wireguard# sudo docker run --rm --privileged --env PACKAGE_ARCH=apollolake --env DSM_VER=7.0 -v $(pwd)/artifacts:/result_spk synobuild
WireGuard version:        1.0.20210606
WireGuard tools version:  1.0.20210424
libmnl version:           1.0.4

Cloning into 'pkgscripts-ng'...
[2021-07-02 00:07:33,875] INFO: Download... https://sourceforge.net/projects/dsgpl/files/toolkit/DSM7.0/base_env-7.0.txz
[2021-07-02 00:29:06,495] INFO: Download... https://sourceforge.net/projects/dsgpl/files/toolkit/DSM7.0/ds.apollolake-7.0.env.txz
[2021-07-02 00:32:09,806] INFO: Download... https://sourceforge.net/projects/dsgpl/files/toolkit/DSM7.0/ds.apollolake-7.0.dev.txz
[2021-07-02 00:33:59,277] INFO: tar -xhf /toolkit_tarballs/base_env-7.0.txz -C /build_env/ds.apollolake-7.0
[2021-07-02 00:34:20,979] INFO: tar -xhf /toolkit_tarballs/ds.apollolake-7.0.env.txz -C /build_env/ds.apollolake-7.0
[2021-07-02 00:35:27,435] INFO: tar -xhf /toolkit_tarballs/ds.apollolake-7.0.dev.txz -C /build_env/ds.apollolake-7.0
[2021-07-02 00:36:06,126] INFO: All task finished.
============================================================
                   Parse argument result
------------------------------------------------------------
platforms     : apollolake
env_section   : default
env_version   : 7.0
dep_level     : 1
parallel_proj : 1
branch        : master
suffix        :
collect       : True
collecter     : True
link          : True
update_link   : False
build         : True
install       : True
only_install  : False
parallel      : 4
build_opt     : -J
install_opt   :
print_log     : True
tee           : True
sdk_ver       : 6.2
package       : WireGuard

Processing [7.0-40955]: apollolake
============================================================
              Start to run "Traverse project"
------------------------------------------------------------
Projects: WireGuard

============================================================
                Start to run "Link Project"
------------------------------------------------------------
Link /pkgscripts-ng -> /build_env/ds.apollolake-7.0/pkgscripts-ng
Link //source/WireGuard -> /build_env/ds.apollolake-7.0/source/WireGuard


============================================================
                Start to run "Build Package"
------------------------------------------------------------
[apollolake] env PackageName=WireGuard /pkgscripts-ng/SynoBuild --apollolake -c --min-sdk 6.2 -J WireGuard
/pkgscripts-ng/include/check: line 93: /dev/null: Permission denied
ERROR: This script must be run as root
Traceback (most recent call last):
  File "/pkgscripts-ng/include/python/exec_env.py", line 76, in execute
    output = commandrunner.run(cmd, display=display, **kwargs)
  File "/pkgscripts-ng/include/python/commandrunner.py", line 39, in run
    raise RunShellFailed(p.returncode, cmd, output)
commandrunner.RunShellFailed

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/pkgscripts-ng/include/python/parallel.py", line 15, in __call__
    result = self.__callable(*args, **kwargs)
  File "/pkgscripts-ng/include/python/pkgcommon.py", line 191, in run_command
    env.execute(cmd, display=len(self.env_config.platforms)
  File "/pkgscripts-ng/include/python/exec_env.py", line 79, in execute
    raise EnvError(
exec_env.EnvError: ('Execute chroot /build_env/ds.apollolake-7.0 env PackageName=WireGuard /pkgscripts-ng/SynoBuild --apollolake -c --min-sdk 6.2 -J WireGuard failed', '/pkgscripts-ng/include/check: line 93: /dev/null: Permission denied\nERROR: This script must be run as root')
multiprocessing.pool.RemoteTraceback:
"""
Traceback (most recent call last):
  File "/pkgscripts-ng/include/python/exec_env.py", line 76, in execute
    output = commandrunner.run(cmd, display=display, **kwargs)
  File "/pkgscripts-ng/include/python/commandrunner.py", line 39, in run
    raise RunShellFailed(p.returncode, cmd, output)
commandrunner.RunShellFailed

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.8/multiprocessing/pool.py", line 125, in worker
    result = (True, func(*args, **kwds))
  File "/pkgscripts-ng/include/python/parallel.py", line 15, in __call__
    result = self.__callable(*args, **kwargs)
  File "/pkgscripts-ng/include/python/pkgcommon.py", line 191, in run_command
    env.execute(cmd, display=len(self.env_config.platforms)
  File "/pkgscripts-ng/include/python/exec_env.py", line 79, in execute
    raise EnvError(
exec_env.EnvError: ('Execute chroot /build_env/ds.apollolake-7.0 env PackageName=WireGuard /pkgscripts-ng/SynoBuild --apollolake -c --min-sdk 6.2 -J WireGuard failed', '/pkgscripts-ng/include/check: line 93: /dev/null: Permission denied\nERROR: This script must be run as root')
"""

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "pkgscripts-ng/PkgCreate.py", line 184, in <module>
    main(sys.argv[1:])
  File "pkgscripts-ng/PkgCreate.py", line 177, in main
    packer.pack_package()
  File "/pkgscripts-ng/include/python/pkguniform.py", line 437, in pack_package
    worker.execute()
  File "/pkgscripts-ng/include/python/pkgcommon.py", line 86, in execute
    self._process_output(self._run(*argv))
  File "/pkgscripts-ng/include/python/pkgcommon.py", line 212, in _run
    return doPlatformParallel(self.run_command, self.env_config.platforms)
  File "/pkgscripts-ng/include/python/parallel.py", line 60, in doPlatformParallel
    output[item] = results[item].get()
  File "/usr/lib/python3.8/multiprocessing/pool.py", line 771, in get
    raise self._value
exec_env.EnvError: ('Execute chroot /build_env/ds.apollolake-7.0 env PackageName=WireGuard /pkgscripts-ng/SynoBuild --apollolake -c --min-sdk 6.2 -J WireGuard failed', '/pkgscripts-ng/include/check: line 93: /dev/null: Permission denied\nERROR: This script must be run as root')
Build log
=========
/pkgscripts-ng/include/check: line 93: /dev/null: Permission denied
ERROR: This script must be run as root
Install log
===========
cat: /build_env/ds.apollolake-7.0/logs.install: No such file or directory

root@NAS:/etc/synology-wireguard#

Can any one shed light on this issue please? I also ran as root rm /dev/null mknod /dev/null c 1 3 chmod 666 /dev/null

then tried to compile again! still no joy!