root@kali:~/rtl8812au# make
/bin/sh: 1: bc: not found
make ARCH=x86_64 CROSS_COMPILE= -C /lib/modules/4.19.0-kali1-amd64/build M=/root/rtl8812au  modules
make[1]: Entering directory '/usr/src/linux-headers-4.19.0-kali1-amd64'
/bin/sh: 1: bc: not found
  CC [M]  /root/rtl8812au/core/rtw_cmd.o
In file included from /root/rtl8812au/core/rtw_cmd.c:17:
/root/rtl8812au/include/drv_types.h:103:10: fatal error: rtw_ioctl_rtl.h: No such file or directory
 #include <rtw_ioctl_rtl.h>
          ^~~~~~~~~~~~~~~~~
compilation terminated.
make[4]: *** [/usr/src/linux-headers-4.19.0-kali1-common/scripts/Makefile.build:309: /root/rtl8812au/core/rtw_cmd.o] Error 1
make[3]: *** [/usr/src/linux-headers-4.19.0-kali1-common/Makefile:1532: _module_/root/rtl8812au] Error 2
make[2]: *** [Makefile:146: sub-make] Error 2
make[1]: *** [Makefile:8: all] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-4.19.0-kali1-amd64'
make: *** [Makefile:1562: modules] Error 2