anchor.diff:    };
   
     v5 = {
  -    version = "5.4.1";
  -    sha256 = "062ilb7s377q3hwfhl8q06vvcw2raydz5ljzlzwy2dmyzmdcndb8";
  -    dataSha256 = "0i45lbnikvgj9kxdp0yphpjjwjcgp4ibn49xkj78j5ic1s9n8jd4";
  +    version = "5.5.0";
  +    sha256 = "sha256-V+ggqvZibSQrJbrtNCEkmRYHhgSKTQsdBh3c8+t6WeA=";
  +    dataSha256 = "sha256-6ZS3EET3nm09eL0czCGadwzon35/EBfAg2KjPX3ZP/0=";
     };
   
   in {
  
positive.code: { lib, stdenv, fetchFromGitHub, cmake, irrlicht, libpng, bzip2, curl, libogg, jsoncpp
  , libjpeg, libXxf86vm, libGLU, libGL, openal, libvorbis, sqlite, luajit
  , freetype, gettext, doxygen, ncurses, graphviz, xorg, gmp, libspatialindex
  , leveldb, postgresql, hiredis, libiconv, OpenGL, OpenAL ? openal, Carbon, Cocoa
  }:
  
  with lib;
  
  let
    boolToCMake = b: if b then "ON" else "OFF";
  
    generic = { version, rev ? version, sha256, dataRev ? version, dataSha256, buildClient ? true, buildServer ? false }: let
      sources = {
  
negative.code:     src = sources.src;
  
      cmakeFlags = [
        "-G Ninja"
        "-DBUILD_CLIENT=${boolToCMake buildClient}"
        "-DBUILD_SERVER=${boolToCMake buildServer}"
        "-DENABLE_GETTEXT=1"
        "-DENABLE_SPATIAL=1"
        "-DENABLE_SYSTEM_JSONCPP=1"
        "-DIRRLICHT_INCLUDE_DIR=${irrlichtMt.dev}/include/irrlicht"
  
        # Remove when https://github.com/NixOS/nixpkgs/issues/144170 is fixed
        "-DCMAKE_INSTALL_BINDIR=bin"
        "-DCMAKE_INSTALL_DATADIR=share"
        "-DCMAKE_INSTALL_DOCDIR=share/doc"
        "-DCMAKE_INSTALL_DOCDIR=share/doc"
        "-DCMAKE_INSTALL_MANDIR=share/man"
        "-DCMAKE_INSTALL_LOCALEDIR=share/locale"
  
      ] ++ optionals buildClient [
        "-DOpenGL_GL_PREFERENCE=GLVND"
      ] ++ optionals buildServer [
        "-DENABLE_PROMETHEUS=1"
      ];
  
      NIX_CFLAGS_COMPILE = "-DluaL_reg=luaL_Reg"; # needed since luajit-2.1.0-beta3
  
      nativeBuildInputs = [ cmake doxygen graphviz ninja ];
  
      buildInputs = [
        irrlichtMt luajit jsoncpp gettext freetype sqlite curl bzip2 ncurses
        gmp libspatialindex
      ] ++ optionals stdenv.isDarwin [
        libiconv OpenGL OpenAL Carbon Cocoa
      ] ++ optionals buildClient [
        libpng libjpeg libGLU libGL openal libogg libvorbis xorg.libX11 libXxf86vm
      ] ++ optionals buildServer [
        leveldb postgresql hiredis prometheus-cpp
      ];
  
      postInstall = ''
  