Project description language
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std::target_platform:: namespace

	describes the target platform


	target_platform::is_windows
		
		bool
		true if and only if the target platform is windows
		ex : 
			if (std::target_platform::is_windows) ...

	target_platform::is_macosx

		bool
		true if and only if the target platform is mac os x
		ex :
			if (std::target_platform::is_macosx) ...

std::host_platform:: namespace

	describes the host platform


	std::host::is_windows

		bool
		true if and only if the target platform is windows
		ex : 
			if (std::host_platform::is_windows) ...

	std::host::is_macosx

		bool
		true if and only if the target platform is mac os x
		ex :
			if (std::host_platform::is_macosx) ...


std:: namespace

	describes a number of standard components

	std::boost:: namespace

		describes the boost components

			std::boost::lexical_cast

			component
			the lexical_cast boost library
			ex :
				executable.use(std::boost::lexical_cast);





Options for the build configuration cache
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default.includesearchpaths

	string or list of strings
	paths to look for when trying to find include directories for components
	ex:
		default.includesearchpaths="/home/me/usr/include");