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[donvito7]

apt update
apt install git dkms
git clone https://github.com/gnab/rtl8812au.git
cp -r rtl8812au /usr/src/rtl8812au-4.2.2
dkms add -m rtl8812au -v 4.2.2
dkms build -m rtl8812au -v 4.2.2

but it fails on

dkms build -m rtl8812au -v 4.2.2

Kernel preparation unnecessary for this kernel. Skipping...
Building module:
cleaning build area...
'make' all KVER=5.15.0-27-generic........(bad exit status: 2)
ERROR (dkms apport): binary package for rtl8812au: 4.2.2 not found
Error! Bad return status for module build on kernel: 5.15.0-27-generic (x86_64)
Consult /var/lib/dkms/rtl8812au/4.2.2/build/make.log for more information.


DKMS make.log for rtl8812au-4.2.2 for kernel 5.15.0-27-generic (x86_64)
Sun  8 May 21:30:30 BST 2022
make ARCH=x86_64 CROSS_COMPILE= -C /lib/modules/5.15.0-27-generic/build M=/var/lib/dkms/rtl8812au/4.2.2/build  modules
make[1]: Entering directory '/usr/src/linux-headers-5.15.0-27-generic'
  CC [M]  /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_cmd.o
  CC [M]  /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_security.o
  CC [M]  /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_debug.o
  CC [M]  /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_io.o
  CC [M]  /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_ioctl_query.o
  CC [M]  /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_ioctl_set.o
  CC [M]  /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_ieee80211.o
  CC [M]  /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_mlme.o
  CC [M]  /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_mlme_ext.o
  CC [M]  /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_wlan_util.o
  CC [M]  /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_vht.o
  CC [M]  /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_pwrctrl.o
  CC [M]  /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_rf.o
  CC [M]  /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_recv.o
  CC [M]  /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_sta_mgt.o
  CC [M]  /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_ap.o
  CC [M]  /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_xmit.o
  CC [M]  /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_p2p.o
  CC [M]  /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_tdls.o
  CC [M]  /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_br_ext.o
/var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_br_ext.c:25:10: fatal error: net/ipx.h: No such file or directory
  25 | #include <net/ipx.h>
      |          ^~~~~~~~~~~
compilation terminated.
make[2]: *** [scripts/Makefile.build:285: /var/lib/dkms/rtl8812au/4.2.2/build/core/rtw_br_ext.o] Error 1
make[1]: *** [Makefile:1875: /var/lib/dkms/rtl8812au/4.2.2/build] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-5.15.0-27-generic'
make: *** [Makefile:1086: modules] Error 2

The chip is actually RTL8811AU but it worked perfectly with older kernels.

Any help?

[Mad Penguin]

Hi @donvito7 ,
Looks like ipx.h might have been depreciated in the latest kernel. From what I can see the driver will probably still work, you may just need the missing header files, so if you try copying;

/usr/src/linux-5.8.11/include/uapi/linux/ipx.h
/usr/src/linux-5.8.11/include/net/ipx.h

=>

/usr/src/linux-(your version)/include/uapi/linux/ipx.h
/usr/src/linux-(your version)/include/net/ipx.h

(or similar, depending in what previously working version you have) 
.. see if that compiles ....