its called a false positive Macs don't like anything that Apple didn't make... Either get a real computer or deal with the fact opening anything that apple didn't make your mac is going to bitch about it
its 100% virus free you can even test yourself using a website that does virus scans on files for you.
Gotta remember apple doesn't trust its own users so they just blacklist everything.
You're a bit of the mark here. Apple discourages using apps which are not made by registered developers. The unofficial build posted here falls into that category. Nothing to do with wether Apple created it or somebody else.
Also it's easy to bypass the warning, but some users are simply too suspicious to do so, or just don't know how.
Also, the components in my Mac are the same as those found in Wintel PC's, and it runs on a Unix based OS. Saying that it's not a real computer is kinda silly you know.