-void *__mmap(void *, size_t, int, int, int, off_t);
-int __munmap(void *, size_t);
-void *__mremap(void *, size_t, size_t, int, ...);
-int __madvise(void *, size_t, int);
+#include <sys/mman.h>
+
+hidden void *__expand_heap(size_t *);
+
+hidden void __malloc_donate(char *, char *);
+
+hidden void *__memalign(size_t, size_t);