clan-app: fix webiview-lib under darwin

pkgs/clan-app/clan-app.code-workspace

@@ -17,6 +17,9 @@
 		},
 		{
 			"path": "../webview-ui"
+		},
+		{
+			"path": "../webview-lib"
 		}
 	],
 	"settings": {

pkgs/webview-lib/default.nix

@@ -17,13 +17,17 @@ pkgs.stdenv.mkDerivation {
   ];
 
   # Dependencies used during the build process, if any
-  buildInputs = with pkgs; [
-    gnumake
-    cmake
-    pkg-config
-    webkitgtk_6_0
-    gtk4
-  ];
+  buildInputs =
+    with pkgs;
+    [
+      gnumake
+      cmake
+      pkg-config
+    ]
+    ++ pkgs.lib.optionals stdenv.isLinux [
+      webkitgtk_6_0
+      gtk4
+    ];
 
   meta = with pkgs.lib; {
     description = "Tiny cross-platform webview library for C/C++. Uses WebKit (GTK/Cocoa) and Edge WebView2 (Windows)";