python-lmdb dependency
I was installing KnotDNS on a Debian (3.16.43-2) machine this afternoon using apt-get and following the instructions at https://www.knot-dns.cz/download/ . I got stuck for a while on the dependency python-lmdb. The apt-get error message was unhelpful; it claimed that I had broken packages. I didn't, I just didn't have jessie-backports as a source.
I think it may be worth changing the installation instructions to reflect this; it was frustrating coming from a position of having installed knot on Ubuntu a few months ago with no issues.