diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index e52214d7f4d..b7fe880fced 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2011-01-13  Joel Brobecker  <brobecker@adacore.com>
+
+	* libunwind-frame.c (__LITTLE_ENDIAN, __BIG_ENDIAN): Define if
+	not already defined.
+
 2011-01-13  Joel Brobecker  <brobecker@adacore.com>
 
 	* ia64-tdep.c (ia64_struct_type_p): New function.
diff --git a/gdb/libunwind-frame.c b/gdb/libunwind-frame.c
index 2cdb1ab1f17..53c42d935b7 100644
--- a/gdb/libunwind-frame.c
+++ b/gdb/libunwind-frame.c
@@ -41,6 +41,16 @@
 
 #include "complaints.h"
 
+/* The following two macros are normally defined in <endian.h>.
+   But systems such as ia64-hpux do not provide such header, so
+   we just define them here if not already defined.  */
+#ifndef __LITTLE_ENDIAN
+#define __LITTLE_ENDIAN 1234
+#endif
+#ifndef __BIG_ENDIAN
+#define __BIG_ENDIAN    4321
+#endif
+
 static int libunwind_initialized;
 static struct gdbarch_data *libunwind_descr_handle;