This repository seems to contain approximately the same codebase with several different available versions. I would recommend using it as it's more actively maintained.

• RTL8192C
• RTL8192D
• RTL8723A
• RTL8188E
• RTL8812A (AC1200)
• RTL8821A (AC1200)
• RTL8192E
• RTL8723B

1. Select your chipset and platform in Makefile. For example, change

...
CONFIG_RTL8821A = n
...

to

...
CONFIG_RTL8821A = y
...

and

CONFIG_PLATFORM_I386_PC = n

to

CONFIG_PLATFORM_I386_PC = y

2. make
3. If you have previously installed a wireless driver for your chipset, sudo modprobe -r [your_chipset_name] where [your_chipset_name] is 8821au for example.
4. sudo make install
5. sudo modprobe [your_chipset_name]

v4.3.14_13455.20150212_BTCOEX20150128-51
Realtek release:
1. This driver can support 8811AU and 8821AU
2. Support BT coexist
3. Support Adaptivity
4. Support efuse and mac address can read from file
5. Support Sniffer feature
6. Support Linux kernel 3.16.0
7. Fix some 802.11 logo issue
8. Fix WPS issue