debian module install fail

[Emanuele Bernardi]

Hi, i normally compile wireguard in my debian machine. Having to change
my laptop i tried to recompile it and on the make module-install i
get this error:

 INSTALL /home/lele/Downloads/tmp/test/WireGuard/src/wireguard.ko
  DEPMOD  4.19.0-5-amd64
Warning: modules_install: missing 'System.map' file. Skipping depmod.
depmod -a

All the dependencies are installed as listed on the wireguard page.
some suggestions?

Thanks
Emanuele
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