This is antirez's kilo text editor (written in C), wrapped in Haskell. No idea where this is going.
The original kilo.c file is in cbits/, as often done with Haskell projects
relying on C code.
Building the code can be done with nix-build release.nix, or, if you don't
want to explicitely clone this repository:
$ nix-build https://github.com/noteed/vtte/archive/master.tar.gz -A vtte