[Gentoo][Kernel] How to compile Linux OS for wire or wireless driver

# eselect kernel list
Available kernel symlink targets:
[1] linux-4.4.6-gentoo

Check symlink
#ls -l /usr/src/linux
lrwxrwxrwx 1 root root 11 Aug 29 22:10 /usr/src/linux -> /usr/src/linux-4.4.6-gentoo

Tick up RTL8723BE wireless card as module and "Qualcomm Atheros AR816x/AR817x support" as module.
# cd /usr/src/linux  
# make menuconfig
# make

If drivers are activated as modules, they must be installed
# make modules_install (modules will be copied to a sub directory of /lib/modules)

# make install


Reference:

• Kernel/Configuration