+#ifndef ENOMEM
+#define ENOMEM 12
+#endif
+
+#ifndef EINVAL
+#define EINVAL 22
+#endif
+
+int
+posix_memalign (memptr, alignment, size)
+ __ptr_t *memptr;
+ __malloc_size_t alignment;
+ __malloc_size_t size;
+{
+ __ptr_t mem;
+
+ if (alignment == 0
+ || alignment % sizeof (__ptr_t) != 0
+ || (alignment & (alignment - 1)) != 0)
+ return EINVAL;
+
+ mem = memalign (alignment, size);
+ if (mem == NULL)
+ return ENOMEM;
+
+ *memptr = mem;
+
+ return 0;
+}
+