Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_26258348_4 (winning_constructor VARCHAR, fastest_lap VARCHAR)
### Question:
How many winning constructor catagories are there when Mark Webber had the fastest lap? 
### Answer:
SELECT COUNT(winning_constructor) FROM table_26258348_4 WHERE fastest_lap = "Mark Webber"