Ethercat installation from repositories - how to step by step

with the latest linuxcnc 2.9.8 ISO-install on a Lenovo M720Q I get compile errors. Any ideas?

more /var/lib/dkms/ethercat-dkms/1.6.9/build/make.log

  CC [M]  /var/lib/dkms/ethercat-dkms/1.6.9/build/devices/stmmac/dwmac-intel-6.12-ethercat.o
/var/lib/dkms/ethercat-dkms/1.6.9/build/devices/stmmac/dwmac-intel-6.12-ethercat.c: In function ‘intel_mgbe_common_data’:
/var/lib/dkms/ethercat-dkms/1.6.9/build/devices/stmmac/dwmac-intel-6.12-ethercat.c:615:15: error: ‘struct plat_stmmacenet_data’ has no member named ‘msi_lpi_vec’; did you mean ‘msi_mac_vec’?
  615 |         plat->msi_lpi_vec = 28;
      |               ^~~~~~~~~~~
      |               msi_mac_vec
/var/lib/dkms/ethercat-dkms/1.6.9/build/devices/stmmac/dwmac-intel-6.12-ethercat.c: In function ‘stmmac_config_multi_msi’:
/var/lib/dkms/ethercat-dkms/1.6.9/build/devices/stmmac/dwmac-intel-6.12-ethercat.c:1001:19: error: ‘struct plat_stmmacenet_data’ has no member named ‘msi_lpi_vec’; did you mean ‘msi_mac_vec’?
 1001 |         if (plat->msi_lpi_vec < STMMAC_MSI_VEC_MAX)
      |                   ^~~~~~~~~~~
      |                   msi_mac_vec
/var/lib/dkms/ethercat-dkms/1.6.9/build/devices/stmmac/dwmac-intel-6.12-ethercat.c:1002:59: error: ‘struct plat_stmmacenet_data’ has no member named ‘msi_lpi_vec’; did you mean ‘msi_mac_vec’?
 1002 |                 res->lpi_irq = pci_irq_vector(pdev, plat->msi_lpi_vec);
      |                                                           ^~~~~~~~~~~
      |                                                           msi_mac_vec
/var/lib/dkms/ethercat-dkms/1.6.9/build/devices/stmmac/dwmac-intel-6.12-ethercat.c: In function ‘intel_eth_pci_probe’:
/var/lib/dkms/ethercat-dkms/1.6.9/build/devices/stmmac/dwmac-intel-6.12-ethercat.c:1084:15: error: ‘struct plat_stmmacenet_data’ has no member named ‘msi_lpi_vec’; did you mean ‘msi_mac_vec’?
 1084 |         plat->msi_lpi_vec = STMMAC_MSI_VEC_MAX;
      |               ^~~~~~~~~~~
      |               msi_mac_vec
make[5]: *** [/usr/src/linux-headers-6.12.86+deb13-common-rt/scripts/Makefile.build:234: /var/lib/dkms/ethercat-dkms/1.6.9/build/devices/stmmac/dwmac-intel-6.12-ethercat.o] Error 1
make[4]: *** [/usr/src/linux-headers-6.12.86+deb13-common-rt/scripts/Makefile.build:471: /var/lib/dkms/ethercat-dkms/1.6.9/build/devices/stmmac] Error 2
make[3]: *** [/usr/src/linux-headers-6.12.86+deb13-common-rt/scripts/Makefile.build:471: /var/lib/dkms/ethercat-dkms/1.6.9/build/devices] Error 2
make[2]: *** [/usr/src/linux-headers-6.12.86+deb13-common-rt/Makefile:1981: /var/lib/dkms/ethercat-dkms/1.6.9/build] Error 2
make[1]: *** [/usr/src/linux-headers-6.12.86+deb13-common-rt/Makefile:236: __sub-make] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-6.12.86+deb13-rt-amd64'
make: *** [Makefile:963: modules] Error 2

# exit code: 2
# elapsed time: 00:03:42