slint gui

flake.nix

@@ -22,7 +22,21 @@
         };
 
         devShells.default = pkgs.mkShell {
-          LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath [ pkgs.openssl ];
+          # 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