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_22903426_1 (scm_system VARCHAR, windows_builders VARCHAR)
### Question:
Name the number of scm system for nant, visual studio
### Answer:
SELECT COUNT(scm_system) FROM table_22903426_1 WHERE windows_builders = "NAnt, Visual Studio"