menuconfig CORE
	bool "Set core features"
	default y

if CORE
	choice 
	prompt "OS support"
	help 
	  OS support configuration. Not all OS'es support all stuff
	
	config OS_LINUX
		bool "Linux"
		default y

	config OS_NETBSD
		bool "NetBSD"
		default n

	endchoice

	config FUTURE
		bool "Future features that planned to be added"
		default n

endif