# Search for the program `self` in all directories from `PATH`
	fun program_is_in_path: Bool
	do
		var sep = if is_windows then ";" else ":"
		var full_path = "PATH".environ
		var paths = full_path.split(sep)
		for path in paths do if path.file_exists then
			if path.join_path(self).file_exists then return true
			if is_windows and (path / self + ".exe").file_exists then return true
		end

		return false
	end