{
  description = "Komp AC - Kompress Accounting";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
        portableServer = import ./packaging/musl {
          inherit pkgs;
          source = self;
          version = "0.8.41";
        };
      in
      {
        packages = pkgs.lib.optionalAttrs (system == "x86_64-linux") {
          portable-server = portableServer;
        };

        devShells.default = pkgs.mkShell {
          # Runtime libraries needed by the Slint/Winit desktop client.
          LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath [
            pkgs.openssl
            pkgs.fontconfig
            pkgs.libx11
            pkgs.libxcursor
            pkgs.libxi
            pkgs.libxrandr
            pkgs.libxext
            pkgs.libxkbcommon
          ];

          # Keep font discovery deterministic when running the prebuilt GUI.
          FONTCONFIG_FILE = "${pkgs.fontconfig}/etc/fonts/fonts.conf";
          FONTCONFIG_PATH = "${pkgs.fontconfig}/etc/fonts";

          buildInputs = with pkgs; [
            mermaid-cli
            # Rust toolchain
            rustc
            cargo
            rustfmt
            clippy
            cargo-watch
	    rust-analyzer
	    cargo-tarpaulin
	    cargo-flamegraph
	    rust-code-analysis

            # Load testing and system monitoring
            ghz
            k6
            sysstat

            # C build tools (for your linker issue)
            gcc
            binutils
            # Fast linker (lld) for quicker dev rebuilds
            lld
            pkg-config
            
            # OpenSSL for crypto dependencies
            openssl
            openssl.dev
            
            # PostgreSQL for sqlx
            postgresql
            sqlx-cli
            
            # Protocol Buffers compiler for gRPC
            protobuf
            protoc-gen-doc
	    buf
          ];

          shellHook = ''
            export PKG_CONFIG_PATH="${pkgs.openssl.dev}/lib/pkgconfig:$PKG_CONFIG_PATH"
            export OPENSSL_DIR="${pkgs.openssl.dev}"
            export OPENSSL_LIB_DIR="${pkgs.openssl.out}/lib"
            export OPENSSL_INCLUDE_DIR="${pkgs.openssl.dev}/include"
            echo "🦀 Rust development environment loaded"
            echo "OpenSSL and PostgreSQL available"
          '';
        };
      }
    );
}