anchor.diff:    src = fetchgit {
       url = git://git.ardour.org/ardour/ardour.git;
       rev = "refs/tags/${tag}";
  -    sha256 = "7d7c8e2c7ccccca6c8324fd874509e1b0d89f3f42cb92982c50d212797463f4c";
  +    sha256 = "0k1z8sbjf88dqn12kf9cykrqj38vkr879n2g6b4adk6cghn8wz3x";
     };
   
     buildInputs = 
  
positive.code: , perl, pkgconfig, python, serd, sord, sratom, suil }:
  
  let
    tag = "3.5.403";
  in
  
  stdenv.mkDerivation rec {
  
negative.code:     ];
  
    patchPhase = ''
      printf '#include "libs/ardour/ardour/revision.h"\nnamespace ARDOUR { const char* revision = \"${revision}\"; }\n' > libs/ardour/revision.cc
      sed 's|/usr/include/libintl.h|${glibc}/include/libintl.h|' -i wscript
      sed -e 's|^#!/usr/bin/perl.*$|#!${perl}/bin/perl|g' -i tools/fmt-bindings
      sed -e 's|^#!/usr/bin/env.*$|#!${perl}/bin/perl|g' -i tools/*.pl
  