1# BTstack Port for POSIX Systems with libusb library 2 3The quickest way to try BTstack is on a Linux or OS X system with an 4additional USB Bluetooth dongle. It requires 5[pkg-config](http://www.freedesktop.org/wiki/Software/pkg-config/) 6and [libusb-1.0](http://libusb.info) or higher to be 7installed. 8 9On Linux, the USB Bluetooth donle is usually not accessible to a regular user. You can: 10- run the examples as root 11- add a udev rule for your dongle to extend access rights to user processes 12 13To add an udev rule, please create `/etc/udev/rules.d/btstack.rules` and add this 14 15 # Match all devices from CSR 16 SUBSYSTEM=="usb", ATTRS{idVendor}=="0a12", MODE="0666" 17 18 # Match DeLOCK Bluetooth 4.0 dongle 19 SUBSYSTEM=="usb", ATTRS{idVendor}=="0a5c", ATTRS{device}=="21e8", MODE="0666" 20 21 # Match Asus BT400 22 SUBSYSTEM=="usb", ATTRS{idVendor}=="0b05", ATTRS{device}=="17cb", MODE="0666" 23 24On OS X, it’s necessary to tell the OS to only use the internal 25Bluetooth. For this, execute: 26 27 sudo nvram bluetoothHostControllerSwitchBehavior=never 28 29and then reboot to activate the change. 30 31