{
  description = "LaTeX Documents for Systemsicherheit";
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
  };
  outputs = { self, nixpkgs }: let
    assignments = [
      "Assignment 4 - Protokollsicherheit (Praxis)"
      "Assignment 5 - Software Security - Teil 1"
      "Assignment 6 - Software Security - Teil 2"
    ];

    forAllSystems = function:
      nixpkgs.lib.genAttrs [
        "x86_64-linux"
        "aarch64-linux"
      ] (system: function {
        inherit system;
        pkgs = import nixpkgs { inherit system; overlays = [ self.overlay ]; };
      });

    forAllAssignments = function:
      nixpkgs.lib.genAttrs assignments (assignment: function assignment);

    texPackages = pkgs: pkgs.texlive.combine {
        inherit (pkgs.texlive) scheme-full latex-bin latexmk;
      };

    lastModifiedDate = self.lastModifiedDate or self.lastModified or "19700101";
    version = builtins.substring 0 8 lastModifiedDate;
  in rec {
    packages = 
      forAllSystems({system, pkgs}: forAllAssignments(assignment: let
        tex = texPackages pkgs;
        document = pkgs.stdenvNoCC.mkDerivation rec {
          name = assignment;
          src = self;
          buildInputs = [ pkgs.coreutils tex ];
          phases = [ "unpackPhase" "buildPhase" "installPhase" ];
          buildPhase = ''
            export PATH="${pkgs.lib.makeBinPath buildInputs}";
            mkdir -p .cache/texmf-var
            cd "./${assignment}"
            env TEXMFHOME=.cache TEXMFVAR=.cache/texmf-var \
              latexmk -interaction=nonstopmode -pdf -lualatex \
              "./abgabe.tex"
          '';
          installPhase = ''
            mkdir -p $out
            cp *.pdf $out/
          '';
        };
      in document) // {
        default = packages.${system}.${pkgs.lib.last assignments};
        "Assignment 7" = pkgs.signatureProxy;
      });

    devShells = forAllSystems({pkgs, ...}: let
      tex = texPackages pkgs;
    in {
      default = pkgs.mkShell {
        packages = [ pkgs.coreutils tex ];
      };
    });

    overlay = final: prev: with final; {
        signatureProxy = stdenv.mkDerivation {
            pname = "SignatureProxy";
            inherit version;

            src = ./7-SGX_Hands-on;

            buildScript = ''
                make
            '';

            installScript = ''
                mkdir -p $out/bin
                cp app $out/bin
                cp enclave.so $out/bin
            '';

            nativeBuildInputs = with pkgs; [
                clang
                glibc
                sgx-sdk
                gmp.dev
                openssl.dev
                pkg-config
            ];

            env = {
                SGX_SDK = pkgs.sgx-sdk;
                SGX_MODE = "SIM";
            };
        };
    };

  };

}