The nixpkgs-unstable channel's programs.sqlite was used to identify
packages producing exactly one binary, and these automatically added
to their package definitions wherever possible.
Version 0.4 failed to build for me on MacOS 10.12.6 (16G1314). (Might be related to the removed libiconv-hacks.) Version 0.5 as specified builds cleanly. Not tested on any other platforms though.
Also 0.4 is from 2008 while 0.5 was released in 2014.
The old homepage now redirects to the GitHub repo.