RTL88x2 Wifi/USB Adaptor

I am trying to get an AC 1200 adapter working on a BBB running Debian 9.8 (Linux 4.9.45-ti-r57). I tried the instructions referenced here:

https://askubuntu.com/questions/1018375/how-do-i-install-driver-for-rtl88x2bu

I get this error. Anybody know how to get this device working?

Kernel preparation unnecessary for this kernel. Skipping…

Building module:
cleaning build area…
make -j1 KERNELRELEASE=4.9.45-ti-r57 KVER=4.9.45-ti-r57 src=/usr/src/rtl88x2bu-5.3.1…(bad exit status: 2)
Error! Bad return status for module build on kernel: 4.9.45-ti-r57 (armv7l)
Consult /var/lib/dkms/rtl88x2bu/5.3.1/build/make.log for more information.
$ less /var/lib/dkms/rtl88x2bu/5.3.1/build/make.log78.20180430_COEX20180427-5959$
DKMS make.log for rtl88x2bu-5.3.1 for kernel 4.9.45-ti-r57 (armv7l)
Tue Mar 5 00:06:13 UTC 2019
make ARCH=armv7l CROSS_COMPILE= -C /lib/modules/4.9.45-ti-r57/build M=/var/lib/dkms/rtl88x2bu/5.3.1/build modules
make[1]: Entering directory ‘/usr/src/linux-headers-4.9.45-ti-r57’
Makefile:628: arch/armv7l/Makefile: No such file or directory
make[1]: *** No rule to make target ‘arch/armv7l/Makefile’. Stop.
make[1]: Leaving directory ‘/usr/src/linux-headers-4.9.45-ti-r57’
Makefile:1995: recipe for target ‘modules’ failed
make: *** [modules] Error 2

I am trying to get an AC 1200 adapter working on a BBB running Debian 9.8 (Linux 4.9.45-ti-r57). I tried the instructions referenced here:

https://askubuntu.com/questions/1018375/how-do-i-install-driver-for-rtl88x2bu

I get this error. Anybody know how to get this device working?

Kernel preparation unnecessary for this kernel. Skipping...

Building module:
cleaning build area...
make -j1 KERNELRELEASE=4.9.45-ti-r57 KVER=4.9.45-ti-r57 src=/usr/src/rtl88x2bu-5.3.1....(bad exit status: 2)

ARCH=arm

Error! Bad return status for module build on kernel: 4.9.45-ti-r57 (armv7l)
Consult /var/lib/dkms/rtl88x2bu/5.3.1/build/make.log for more information.
$ less /var/lib/dkms/rtl88x2bu/5.3.1/build/make.log78.20180430_COEX20180427-5959$
DKMS make.log for rtl88x2bu-5.3.1 for kernel 4.9.45-ti-r57 (armv7l)
Tue Mar 5 00:06:13 UTC 2019
make ARCH=armv7l CROSS_COMPILE= -C /lib/modules/4.9.45-ti-r57/build M=/var/lib/dkms/rtl88x2bu/5.3.1/build modules
make[1]: Entering directory '/usr/src/linux-headers-4.9.45-ti-r57'
Makefile:628: arch/armv7l/Makefile: No such file or directory
make[1]: *** No rule to make target 'arch/armv7l/Makefile'. Stop.
make[1]: Leaving directory '/usr/src/linux-headers-4.9.45-ti-r57'
Makefile:1995: recipe for target 'modules' failed
make: *** [modules] Error 2

Regards,