I realize it's ages ago these links were posted, but I just wanted to say THANK YOU anyway - they saved my day!
Roku only links to the very old builds of firefly, which work, but crash on indexing and transcoding libraries with FLAC files. And since the reason I'm using Firefly in the first place is to enable my SoundBridge to play my FLAC files, that's pretty uncool.
Svn-1586 is working flawlessly for me now - WHAT A JOY! Didn't get around to trying 1696 (will do if I encounter trouble with 1586).