I was unable to find it, which doesn't quite mean it doesn't exist.
The happy news is that I went ahead and tried the precompiled linux binary, and it works just fine in my 64 bit installation. The only error I have is in trying to convert cbz file. I get the following error, which I also got on my windows installation of Calibre.
('RuntimeError', u'Failed to load ImageMagick')
Traceback (most recent call last):
File "", line 928, in worker
File "", line 886, in work
File "library.pyz/calibre.ebooks.lrf.comic.convert_from", line 393, in do_convert
File "library.pyz/calibre.ebooks.lrf.comic.convert_from", line 255, in process_pages
RuntimeError: Failed to load ImageMagick
Thanks for all your assistance.