update dependencies and lock with nix

.envrc

@@ -0,0 +1 @@
+use flake

flake.lock

@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1756125398,
+        "narHash": "sha256-XexyKZpf46cMiO5Vbj+dWSAXOnr285GHsMch8FBoHbc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "3b9f00d7a7bf68acd4c4abb9d43695afb04e03a5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "Rust dev shell for building project with fontconfig and OpenGL support on nixos";
+
+  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 = import nixpkgs {
+          inherit system;
+        };
+
+        nativeBuildInputs = with pkgs; [
+          git
+	  pkg-config
+          fontconfig
+          freetype
+          rustc
+          cmake
+          gnumake
+	  gcc
+          cargo
+          xorg.libXcursor
+          xorg.libXrandr
+          xorg.libXi
+          xorg.libX11
+          xorg.libxcb
+          libxkbcommon
+          libGL
+          libGLU
+          mesa
+          wayland
+          libglibutil
+        ];
+
+        fontconfigPcPath = "${pkgs.fontconfig.dev}/lib/pkgconfig";
+      in {
+        devShells.default = pkgs.mkShell {
+          name = "rust-fontconfig-shell";
+          packages = nativeBuildInputs;
+
+          shellHook = ''
+            export PKG_CONFIG_PATH=${fontconfigPcPath}:$PKG_CONFIG_PATH
+            export LD_LIBRARY_PATH=${pkgs.lib.makeLibraryPath nativeBuildInputs}:$LD_LIBRARY_PATH
+            echo "PKG_CONFIG_PATH set to: ${fontconfigPcPath}"
+            echo "LD_LIBRARY_PATH set for runtime OpenGL/GUI deps"
+          '';
+        };
+      });
+}
+