anchor.diff:      cp -r ${fetchFromGitHub {
         owner = "neomutt";
         repo = "neomutt-test-files";
  -      rev = "1ee274e9ae1330fb901eb7b8275b3079d7869222";
  -      sha256 = "0dhilz4rr7616jh8jcvh50a3rr09in43nsv72mm6f3vfklcqincp";
  +      rev = "8629adab700a75c54e8e28bf05ad092503a98f75";
  +      sha256 = "1ci04nqkab9mh60zzm66sd6mhsr6lya8wp92njpbvafc86vvwdlr";
       }} $(pwd)/test-files
  +    chmod -R +w test-files
       (cd test-files && ./setup.sh)
   
       export NEOMUTT_TEST_DIR=$(pwd)/test-files
  
positive.code:     # and use a far more comprehensive list than the one shipped with neomutt
      substituteInPlace sendlib.c \
        --replace /etc/mime.types ${mailcap}/etc/mime.types
    '';
  
    configureFlags = [
  
negative.code: }:
  
  stdenv.mkDerivation rec {
    version = "20200619";
    pname = "neomutt";
  
    src = fetchFromGitHub {
      owner  = "neomutt";
      repo   = "neomutt";
      rev    = version;
      sha256 = "0dhdpd0wdk5bam0q7cvjy4f451ai0mapmyrar7r7m5dnn6lcwvfv";
    };
  
    buildInputs = [
  