We can't use -D_FILE_OFFSET_BITS=64 here, as
libdwarf.h is a public header.

--- a/lib/libdwarf/libdwarf.h
+++ b/lib/libdwarf/libdwarf.h
@@ -32,7 +32,7 @@
 #include <libelf.h>
 
 typedef int		Dwarf_Bool;
-typedef off_t		Dwarf_Off;
+typedef __off64_t	Dwarf_Off;
 typedef uint64_t	Dwarf_Unsigned;
 typedef uint16_t	Dwarf_Half;
 typedef uint8_t		Dwarf_Small;