I can confirm that with the following line in sources.list:
deb https://packagecloud.io/Flirc/repo/ubuntu/ trusty main
Apt correctly brings this in and offers to install flirc and one dependency, libqt5xmlpatterns5. This looks like it works.
I have not installed and verified, as I've been burned by apt tantrums and broken packages before when using PPA or other not-quite-debian repos. Don't intend to go down this road myself, but it looks promising if anyone else has this problem and can't work around.
Me, I've configured Flirc on my windows box instead, and once plugged into the debian HTPC it's all peachy.