this derivation will be built:
  /nix/store/9wqaqix5a9183cfcqx8gnxk22rm8xzjm-gastown-1.2.1.drv
this path will be fetched (464.1 KiB download, 1.1 MiB unpacked):
  /nix/store/bqvg5jr0kz93mgjsnq5apy9idlwygjv4-tmux-3.7c