is probably the most useful variable, since it allows you to find which
variables a driver uses.
-.. envvar:: GALLIUM_GALAHAD <bool> (false)
-
-Controls if the :ref:`galahad` sanity checker module should be used.
-
.. envvar:: GALLIUM_RBUG <bool> (false)
Controls if the :ref:`rbug` should be used.
.. envvar:: GALLIUM_TRACE <string> ("")
-If set, this variable will cause the :ref:`Trace` output to be written to the
+If set, this variable will cause the :ref:`trace` output to be written to the
specified file. Paths may be relative or absolute; relative paths are relative
to the working directory. For example, setting it to "trace.xml" will cause
the trace to be written to a file of the same name in the working directory.