Thank you all for the replies.
@Modisc Yes, I made sure that those dependencies are installed. They were installed automatically so I didn’t have to do anything. When I tried to run it (viber) the first time it said that it needs qt5 to run so I installed that to (qt5-base). And then the error mentioned above appeared.
@anarch I also did what you suggested but everything seemed fine with the dependencies.
I managed to get it running somehow but I didn’t have a chance to try out if it works because no contacts whatsoever are shown. This might not be a problem though because the same thing happened when I first installed it on my other (former) main OS but I can’t say it works for sure before I test it.
After double-checking the dependencies once more with no results I tried to reinstall it (again through pamac) and then an error showed up while installing, after the package was built, saying something on the lines of: “
there were errors... the files are at /tmp/[something]_viber”. So I copied the contents of the /tmp/[something]_viber directory to another directory (in home) and tried to run viber from there. It ran. There are still some complains about sslv3… but at least it runs now.
Thank you for the help. My experience here was nothing like what I’ve heard about arch forums (I know Antergos is not exactly arch but still I was prepared for a bit of hostility).
Probably I’m gonna have to ask some questions again int he future when I break something.