CREATE TABLE table_25530 ("Name" TEXT, "Platform" TEXT, "License" TEXT, "Windows builders" TEXT, "Java builders" TEXT, "Other builders" TEXT, "SCM system" TEXT, "Notification" TEXT, "IDE Integration" TEXT, "Other Integration" TEXT)

Name the number of scm system for nant, visual studio
SELECT COUNT("SCM system") FROM table_25530 WHERE "Windows builders" = 'NAnt, Visual Studio'
SELECT COUNT("SCM system") FROM "table_25530" WHERE "Windows builders" = 'NAnt, Visual Studio'