I disabled the Kxstudio repositories and then I had to reinstall lv2-dev, liblilv-dev and libsratom-dev from the official Ubuntu repository.
After that I was able to build succesfully Guitarix from source code.
Thank you all for the answers!
I disabled the Kxstudio repositories and then I had to reinstall lv2-dev, liblilv-dev and libsratom-dev from the official Ubuntu repository.
After that I was able to build succesfully Guitarix from source code.
Thank you all for the answers!