Fail to install on Rpi3b with openhabian

Hi,

I have Z2M installed on test RPI, now its time to migrate into my openhab RPI.
I can’t resolve the installation issue I’m having

Traceback (most recent call last):
  File "/usr/lib/node_modules/npm/node_modules/node-gyp/gyp/gyp_main.py", line 47, in <module>
    import gyp
  File "/usr/lib/node_modules/npm/node_modules/node-gyp/gyp/pylib/gyp/__init__.py", line 10, in <module>
    import gyp.input
  File "/usr/lib/node_modules/npm/node_modules/node-gyp/gyp/pylib/gyp/input.py", line 11, in <module>
    import multiprocessing
ValueError: bad marshal data (unknown type code)
gyp ERR! configure error
gyp ERR! stack Error: `gyp` failed with exit code: 1
gyp ERR! stack     at ChildProcess.onCpExit (/usr/lib/node_modules/npm/node_modules/node-gyp/lib/configure.js:351:16)
gyp ERR! stack     at ChildProcess.emit (events.js:311:20)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:275:12)
gyp ERR! System Linux 4.19.66-v7+
gyp ERR! command "/usr/bin/node" "/usr/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
gyp ERR! cwd /opt/zigbee2mqtt/node_modules/zigbee-herdsman/node_modules/@serialport/bindings
gyp ERR! node -v v12.16.1
gyp ERR! node-gyp -v v5.0.5
gyp ERR! not ok
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! @serialport/bindings@8.0.7 install: `prebuild-install --tag-prefix @serialport/bindings@ || node-gyp rebuild`
npm ERR! Exit status 1

[09:58:36] openhabian@ChuraOH:/opt/zigbee2mqtt$ node --version
v12.16.1
[10:01:19] openhabian@ChuraOH:/opt/zigbee2mqtt$ npm --version
6.13.4

Any tips ?