Index: b/grub/asmstub.c
===================================================================
--- a/grub/asmstub.c
+++ b/grub/asmstub.c
@@ -18,10 +18,13 @@
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#include <features.h>
+#if !defined __UCLIBC__ || (defined __UCLIBC__ && defined __UCLIBC_HAS_LFS__)
 /* Try to use glibc's transparant LFS support. */
 #define _LARGEFILE_SOURCE	1
 /* lseek becomes synonymous with lseek64.  */
 #define _FILE_OFFSET_BITS	64
+#endif
 
 /* Simulator entry point. */
 int grub_stage2 (void);
Index: b/lib/device.c
===================================================================
--- a/lib/device.c
+++ b/lib/device.c
@@ -18,10 +18,13 @@
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#include <features.h>
+#if !defined __UCLIBC__ || (defined __UCLIBC__ && defined __UCLIBC_HAS_LFS__)
 /* Try to use glibc's transparant LFS support. */
 #define _LARGEFILE_SOURCE       1
 /* lseek becomes synonymous with lseek64.  */
 #define _FILE_OFFSET_BITS       64
+#endif
 
 #include <stdio.h>
 #include <stdlib.h>