I've just downloaded the qt from flappycoin.info, but what's hat: Trojan.Win32.IRCbot.cvl?

Not 100% sure, this is built from litecoin source.

However.

https://www.virustotal.com/ca/file/cc60dfea58df298eef205903d2ec3c28e625b6f571effc751bdfd299995c067b/analysis/1399892740/

Litecoin seems to have same detections.

Most likely a false definition.

You can look through source of flappycoin below

https://github.com/flappycoin-project/flappycoin

You can see the initial commits, what has exactly been changed from litecoin source, and compile it yourself. Compiling from direct source, be it litecoin of flappycoin will give you the same errors however.