1. Install cygport via Cygwin's installer.

2. Download source and perform all build steps.

  $ cygport nix/nix.cygport download all

If cygport warns about missing dependencies, install them via Cygwin's installer and run all build steps again.

  $ cygport nix/nix.cygport all

3. Currently, none of our cygports needs a postinstall script; it is enough to unpack to /.

  $ tar xvfJ nix/nix-1.8-1.x86_64/dist/nix/nix-1.8-1.tar.xz -C /