anchor.diff:  }:
   
   stdenv.mkDerivation rec {
  -  version = "20200501";
  +  version = "20200619";
     pname = "neomutt";
   
     src = fetchFromGitHub {
       owner  = "neomutt";
       repo   = "neomutt";
       rev    = version;
  -    sha256 = "1xrs2bagrcg489zp7g39l3rrpgz8n1ji9cbr21wrnasfbhqcsmnx";
  +    sha256 = "0dhdpd0wdk5bam0q7cvjy4f451ai0mapmyrar7r7m5dnn6lcwvfv";
     };
   
     buildInputs = [
  
positive.code:     cp -r ${fetchFromGitHub {
        owner = "neomutt";
        repo = "neomutt-test-files";
        rev = "1ee274e9ae1330fb901eb7b8275b3079d7869222";
        sha256 = "0dhilz4rr7616jh8jcvh50a3rr09in43nsv72mm6f3vfklcqincp";
      }} $(pwd)/test-files
      (cd test-files && ./setup.sh)
  
      export NEOMUTT_TEST_DIR=$(pwd)/test-files
  
negative.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
    '';
  
    preBuild = ''
      export HOME=$(mktemp -d)
    '';
  
    configureFlags = [
  