``clang -Xclang <option> ...`` to force the driver pass ``<option>`` to
``clang -cc1``.
-I get errors about some headers being missing (``stddef.h``, ``stdard.h``)
+I get errors about some headers being missing (``stddef.h``, ``stdarg.h``)
--------------------------------------------------------------------------
-Some header files (``stddef.h``, ``stdard.h``, and others) are shipped with
+Some header files (``stddef.h``, ``stdarg.h``, and others) are shipped with
Clang --- these are called builtin includes. Clang searches for them in a
directory relative to the location of the ``clang`` binary. If you moved the
``clang`` binary, you need to move the builtin headers, too.