anchor.diff:    src = fetchFromGitHub {
       owner = "Ardour";
       repo = "ardour";
  -    rev = "fe672c827cb2c08c94b1fa7e527d884c522a1af7";
  -    sha256 = "12yfy9l5mnl96ix4s2qicp3m2zscli1a4bd50nk9v035pgf77s3f";
  +    rev = "8d46cc99fe2778c5658b659f4f1fe6ac828bb9e9";
  +    sha256 = "0rr55s3rirlfq455x0xzx8w09kji1fac2n8cx9p6p57qsfvxxblp";
     };
   
     buildInputs =
  
positive.code:     homepage = http://ardour.org/;
      license = licenses.gpl2;
      platforms = platforms.linux;
      maintainers = [ maintainers.goibhniu ];
    };
  }
  
negative.code:   # "git describe" when _not_ on an annotated tag(!): MAJOR.MINOR-REV-HASH.
  
    # Version to build.
    tag = "4.3";
  
  in
  
  