Quite simple. Just install it using
sudo apt-get install lirc
Update /boot/config.txt with dtoverlay=gpio-ir,gpio_pin=18
To use lirc in “default” mode (the default mode after installation is “devinput” mode) modify by sudo nano /etc/lirc/lirc_options.conf.
Change to driver = default
BTW: My first post on this blog 🙂