-#ifdef FS_32BIT
-struct { unsigned char m[8]; } cliserv_magic = { { 0x00, 0x00, 0x42, 0x02, 0x81, 0x86, 0x12, 0x53 } };
-#else
-u64 cliserv_magic = 0x00420281861253LL;
+#if NBD_LFS==1
+/* /usr/include/features.h (included from /usr/include/sys/types.h)
+ defines this when _GNU_SOURCE is defined
+ */
+#ifndef _LARGEFILE_SOURCE
+#define _LARGEFILE_SOURCE
+#endif
+#define _FILE_OFFSET_BITS 64