anchor.diff:  
     postInstall = ''
       mkdir -p $out/etc/bash_completion.d
  -    cp -v examples/bash_completion_tmux.sh $out/etc/bash_completion.d/tmux
  +    cp -v ${bashCompletion}/completions/tmux $out/etc/bash_completion.d/tmux
     '';
   
     meta = {
  
positive.code: { stdenv, fetchurl, ncurses, libevent, pkgconfig }:
  
  stdenv.mkDerivation rec {
    name = "tmux-${version}";
    version = "2.1";
  
    src = fetchurl {
      url = "https://github.com/tmux/tmux/releases/download/${version}/${name}.tar.gz";
      sha256 = "0xk1mylsb08sf0w597mdgj9s6hxxjvjvjd6bngpjvvxwyixlwmii";
    };
  
    nativeBuildInputs = [ pkgconfig ];
  
    buildInputs = [ ncurses libevent ];
  
  
negative.code:     license = stdenv.lib.licenses.bsd3;
  
      platforms = stdenv.lib.platforms.unix;
      maintainers = with stdenv.lib.maintainers; [ thammers fpletz ];
    };
  }
  