anchor.diff:      sha256 = "00wmbdghqbz6x95m1mcdd3wd46l6hgcr4wggdp049dbifh3qqvqf";
     };
   
  -  buildInputs = [ elfutils ];
  +  buildInputs = [ elfutils libunwind ];
   
     preConfigure =
       ''
  
positive.code: { stdenv, fetchurl, elfutils }:
  
  stdenv.mkDerivation rec {
    name = "ltrace-0.7.3";
  
negative.code:       makeFlagsArray=(INSTALL="install -c")
      '';
  
    meta = with stdenv.lib; {
      description = "Library call tracer";
      homepage = https://www.ltrace.org/;
      platforms = stdenv.lib.platforms.linux;
    };
  }
  