Index: glibc-2.19/sysdeps/mach/hurd/bits/fcntl.h
===================================================================
--- glibc-2.19.orig/sysdeps/mach/hurd/bits/fcntl.h
+++ glibc-2.19/sysdeps/mach/hurd/bits/fcntl.h
@@ -184,7 +184,7 @@ struct flock
   {
     int l_type;		/* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.  */
     int l_whence;	/* Where `l_start' is relative to (like `lseek').  */
-#ifndef __USE_FILE_OFFSET64
+#if !defined(__USE_FILE_OFFSET64) || defined(MIG_32BIT_STRUCT_FLOCK)
     __off_t l_start;	/* Offset where the lock begins.  */
     __off_t l_len;	/* Size of the locked area; zero means until EOF.  */
 #else