anchor.diff:  
   in rec {
     vala_0_36 = generic {
  -    major = "0.36";
  -    minor = "19";
  +    version = "0.36.19";
       sha256 = "05si2f4zjvq0q3wqfh1wxdq20jy1xqxq2skqh8vfh2jyp355lwar";
     };
   
     vala_0_38 = generic {
  -    major = "0.38";
  -    minor = "10";
  -    sha256 = "1rdwwqs973qv225v8b5izcgwvqn56jxgr4pa3wxxbliar3aww5sw";
  +    version = "0.38.10";
  +    sha256  = "1rdwwqs973qv225v8b5izcgwvqn56jxgr4pa3wxxbliar3aww5sw";
       extraNativeBuildInputs = [ autoconf ] ++ lib.optional stdenv.isDarwin libtool;
     };
   
     vala_0_40 = generic {
  -    major = "0.40";
  -    minor = "15";
  +    version = "0.40.15";
       sha256 = "0mfayli159yyw6abjf6sgq41j54mr3nspg25b1kxhypcz0scjm19";
     };
   
     vala_0_42 = generic {
  -    major = "0.42";
  -    minor = "7";
  +    version = "0.42.7";
       sha256 = "029ksbsdpl581wzy570kj4kkw8b4bizgh494c051zsvkwck55p83";
     };
   
     vala_0_44 = generic {
  -    major = "0.44";
  -    minor = "3";
  +    version = "0.44.3";
       sha256 = "1sgas7z6y9r2mf4pxry3fx2awdnzn3vlg2sxd3hqpy2a90ib8lw5";
     };
   
  
positive.code:         #     0.42.4: https://github.com/openembedded/openembedded-core/raw/f2b4f9ec6f44dced7f88df849cca68961419eeb8/meta/recipes-devtools/vala/vala/disable-graphviz.patch
          "0.44" = ./disable-graphviz-0.44.1.patch;
  
        }.${major} or (throw "no graphviz patch for this version of vala");
  
      disableGraphviz = atLeast "0.38" && !withGraphviz;
  
    in stdenv.mkDerivation rec {
      name = "vala-${version}";
      version = "${major}.${minor}";
  
      setupHook = substituteAll {
        src = ./setup-hook.sh;
        apiVersion = major;
      };
  
      src = fetchurl {
        url = "mirror://gnome/sources/vala/${major}/${name}.tar.xz";
        inherit sha256;
      };
  
  
negative.code: 
  let
    generic = lib.makeOverridable ({
      version, sha256,
      extraNativeBuildInputs ? [],
      extraBuildInputs ? [],
      withGraphviz ? false
    }:
    let
      # Patches from the openembedded-core project to build vala without graphviz
      # support. We need to apply an additional patch to allow building when the
      # header file isn't available at all, but that patch (./gvc-compat.patch)
  