@Alessandro-Floris the link you're following is for the Omega 1, which is based on OpenWRT. The Omega 2 makes use of LEDE, which is a branch/fork of OpenWRT. Ergo, you need to use the LEDE toolchain. Searching this forum should reveal some light on the matter.
Posts made by Damien Hawes
RE: Crosscompile NetBeans C/C++ for Omega 2
[Q] MicroSD Card - What is the maximum capacity supported by the Omega2+?
As per the title, I'd like to know the maximum allowable capacity for the micro SD card.
RE: Gpio Groups
@luz holy hell dude. Your explanation was amazing. I just got my 2+, and I've been struggling my butt off to simply light up a set of LEDs. I looked at the pin out diagram, and I was looking for a way to switch pins 7, 8 and 9 to GPIOs. I must admit, the documentation is quite ... lacking.