Hopefully fixed weird gstreamer traceback.

build-local.sh

@@ -26,6 +26,12 @@ for cmd in meson ninja python3; do
     fi
 done
 
+if ! python3 -c "import tomlkit" 2>/dev/null; then
+    echo "Error: Python module tomlkit is not installed"
+    echo "Please install: python-tomlkit"
+    exit 1
+fi
+
 # Check for optional dependencies
 missingOptional=()
 if ! python3 -c "import gi" 2>/dev/null; then