diff --git a/libcpp/include/cpplib.h b/libcpp/include/cpplib.h
index a497811..cfc6ccd 100644
--- a/libcpp/include/cpplib.h
+++ b/libcpp/include/cpplib.h
@@ -956,9 +956,16 @@
 
 #define CPP_N_FRACT	0x100000 /* Fract types.  */
 #define CPP_N_ACCUM	0x200000 /* Accum types.  */
+#define CPP_N_FLOATN	0x400000 /* _FloatN types.  */
+#define CPP_N_FLOATNX	0x800000 /* _FloatNx types.  */
 
 #define CPP_N_USERDEF	0x1000000 /* C++0x user-defined literal.  */
 
+#define CPP_N_WIDTH_FLOATN_NX	0xF0000000 /* _FloatN / _FloatNx value
+					      of N, divided by 16.  */
+#define CPP_FLOATN_SHIFT	24
+#define CPP_FLOATN_MAX	0xF0
+
 /* Classify a CPP_NUMBER token.  The return value is a combination of
    the flags from the above sets.  */
 extern unsigned cpp_classify_number (cpp_reader *, const cpp_token *,