MANPAGER = "${pkgs.vim}/bin/vim -M +MANPAGER -";
MANPATH = [
  "${home_directory}/.nix-profile/share/man"
  "${home_directory}/.nix-profile/man"
  "${config.system.path}/share/man"
  "${config.system.path}/man"
  "/usr/local/share/man"
  "/usr/share/man"
  "/Developer/usr/share/man"
  "/usr/X11/man"
];