OpenWrt WEP client

Like every year, my trusty Fonera 1 running OpenWrt Kamizake repeats the nearest signal to my Hotel room. Until now, my lovely Sol Bahia had an open WiFi access, which was trivially configured in OpenWrt, but this year, they changed their access point to a Zyxel Prestige 650HW-33 (don’t ask) which is “secured” (yeah, right) with WEP. Why am I writing an article about this? because I tend to never use WEP and forget how to configure it on my router everytime.