provides a means to locate or invoke developer tools from the command-line, without requiring users to modify Makefiles or otherwise take inconvenient measures to support multiple Xcode tool chains. The tool xcode-select(1) is used to set a system default for the active developer directory, and may be overridden by the DEVELOPER_DIR environment variable (see ENVIRONMENT). The SDK which will be searched defaults to the most recent available SDK, and can be specified by the SDKROOT environment variable or the --sdk option (which takes precedences over SDKROOT). When used to invoke another tool (as opposed to simply finding it), xcrun will provide the absolute path to the selected SDK in the SDKROOT environment variable. See ENVIRONMENT for more information. Usage xcrun supports several different usages, to both look up the paths to tools as well as execute them. When used with the --find argument, as in xcrun [--sdk <SDK name>] --find <tool name>, the absolute path to the tool (in the provided SDK, if given) will be printed. When used without --find, the name of a tool is required and the tool will be executed with the provided arguments. When used as the target of a symbolic link, it derives the tool name to use from the name it was invoked under, and then executes that tool. ......