anchor.diff:  
     meta = {
       homepage = https://github.com/tmakkonen/sipcmd;
  -    description = "sipcmd - the command line SIP/H.323/RTP softphone";
  +    description = "The command line SIP/H.323/RTP softphone";
       platforms = with stdenv.lib.platforms; linux;
     };
   }
  
positive.code: { stdenv, fetchgit, opal, ptlib }:
  
  stdenv.mkDerivation rec {
  
  
negative.code: 
    name = "sipcmd-${rev}";
    
    src = fetchFromGitHub {
      repo = "sipcmd";
      owner = "tmakkonen";
      inherit rev;
      sha256 = "072h9qapmz46r8pxbzkfmc4ikd7dv9g8cgrfrw21q942icbrvq2c";
    };
  
  