ZNC github tarball - Do not use it

Today I tried to compile ZNC 1.6.5 from source (.tar.gz) which I got from their releases on Github. Without checking their installation instruction first, I dove right in. After a quick ./ I was happily underway and after quick configure I turned to make and it surprised me with the following gem: Packing man page znc.1.gz... Packing man page znc-buildmod.1.gz... It looks like git submodules are not initialized. Run: git submodule update --init --recursive Makefile:167: recipe for target 'third_party/Csocket/Csocket.