+/*----- Tweakables --------------------------------------------------------*/
+
+/* --- @MPARENA_TRIVIAL@ --- *
+ *
+ * Make the allocator a passthrough. It immediately calls the underlying
+ * allocation functions rather than attempting to keep track of blocks
+ * itself.
+ */
+
+/* #define MPARENA_TRIVIAL */
+
+/* --- @MPARENA_DEBUG@ --- *
+ *
+ * The name of an output trace file to which logging information about the
+ * state of arena trees should be written. If unset, no logging is done.
+ */
+
+/* #define MPARENA_DEBUG "mparena.out" */
+