+/* Tri-state flag to determine whether we attempt to mark pages
+ * as targets for virtual memory deduplication (ala MADV_MERGEABLE
+ * on Linux).
+ *
+ * 1: Yes
+ * 0: No
+ * -1: default, yes for compressed cores, no otherwise.
+ */
+extern int merge_core_pages;
+
+extern lispobj load_core_file(char *file, os_vm_offset_t offset);
+extern os_vm_offset_t search_for_embedded_core(char *file);
+
+/* arbitrary string identifying this build, embedded in .core files to
+ * prevent people mismatching a runtime built e.g. with :SB-SHOW
+ * against a .core built without :SB-SHOW (or against various grosser
+ * mismatches, e.g. a .core built with an old version of the code
+ * against a runtime with patches which add new C code) */
+extern unsigned char build_id[];