GNU/Linux Manjaro Installing Broadcom BCM4311/BCM4312/BCM4313 Driver Guide
How to Install Broadcom BCM4311/BCM4312/BCM4313 Wi-fi/Bluetooth Driver on Manjaro GNU/Linux desktop – Step by step Tutorial.
The Package Provides the Source Code for the wl Kernel Modules and makes use of the DKMS Build Utility to Install them for the Running Kernel.

GNU/Linux Manjaro Broadcom BCM4311/BCM4312/BCM4313 Driver Installation Guide