+#ifdef MMALLOC_WANT_OVERRIDE_LEGACY
+
+/* Fake implementations, they are used to fool dlsym:
+ * dlsym used calloc and falls back to some other mechanism
+ * if this fails.
+ */
+static void* mm_fake_calloc(size_t nmemb, size_t size) { return NULL; }
+static void* mm_fake_malloc(size_t n) { return NULL; }
+static void* mm_fake_realloc(void *p, size_t s) { return NULL; }
+
+/* Function signatures for the main malloc functions: */
+typedef void* (*mm_malloc_t)(size_t size);
+typedef void (*mm_free_t)(void*);
+typedef void* (*mm_calloc_t)(size_t nmemb, size_t size);
+typedef void* (*mm_realloc_t)(void *ptr, size_t size);
+
+/* Function pointers to the real/next implementations: */
+static mm_malloc_t mm_real_malloc = mm_fake_malloc;
+static mm_free_t mm_real_free;
+static mm_calloc_t mm_real_calloc = mm_fake_calloc;
+static mm_realloc_t mm_real_realloc = mm_fake_realloc;
+
+#define GET_HEAP() __mmalloc_current_heap
+
+/** Constructor functions used to initialize the malloc implementation
+ */
+static void __attribute__((constructor(101))) mm_legacy_constructor()