Build files for the Nix package manager.
Rebase from the upstream branch.
Use nix-build to build the gitit binaries, or nix-shell
to enter a shell with preinstalled dependencies suitable for hacking.
Note that the shell doesn't include its own cabal-install.
To build inside the shell, do:
nix-shell
cabal update
cabal configure
cabal build
Or you can substitute cabal repl at the end.