+#ifndef LISP_FEATURE_GENCGC
+/* FIXME: genesis/constants.h also defines this with a constant value */
+#define DYNAMIC_SPACE_START current_dynamic_space
+#endif
+
+#define BINDING_STACK_SIZE (1024*1024) /* chosen at random */
+/* eventually choosable per-thread: */
+#define DEFAULT_CONTROL_STACK_SIZE (2*1024*1024)
+