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diff --git a/libdecnumber/dpd/decimal64.h b/libdecnumber/dpd/decimal64.h
new file mode 100644
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+++ b/libdecnumber/dpd/decimal64.h
@@ -0,0 +1,96 @@
+/* Decimal 64-bit format module header for the decNumber C Library.
+   Copyright (C) 2005, 2007, 2009 Free Software Foundation, Inc.
+   Contributed by IBM Corporation.  Author Mike Cowlishaw.
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it under
+   the terms of the GNU General Public License as published by the Free
+   Software Foundation; either version 3, or (at your option) any later
+   version.
+
+   GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+   WARRANTY; without even the implied warranty of MERCHANTABILITY or
+   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+   for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+/* ------------------------------------------------------------------ */
+/* Decimal 64-bit format module header				      */
+/* ------------------------------------------------------------------ */
+
+#if !defined(DECIMAL64)
+  #define DECIMAL64
+  #define DEC64NAME	"decimal64"		      /* Short name   */
+  #define DEC64FULLNAME "Decimal 64-bit Number"	      /* Verbose name */
+  #define DEC64AUTHOR	"Mike Cowlishaw"	      /* Who to blame */
+
+
+  /* parameters for decimal64s					      */
+  #define DECIMAL64_Bytes  8		/* length		      */
+  #define DECIMAL64_Pmax   16		/* maximum precision (digits) */
+  #define DECIMAL64_Emax   384		/* maximum adjusted exponent  */
+  #define DECIMAL64_Emin  -383		/* minimum adjusted exponent  */
+  #define DECIMAL64_Bias   398		/* bias for the exponent      */
+  #define DECIMAL64_String 24		/* maximum string length, +1  */
+  #define DECIMAL64_EconL  8		/* exp. continuation length   */
+  /* highest biased exponent (Elimit-1)				      */
+  #define DECIMAL64_Ehigh  (DECIMAL64_Emax+DECIMAL64_Bias-DECIMAL64_Pmax+1)
+
+  /* check enough digits, if pre-defined			      */
+  #if defined(DECNUMDIGITS)
+    #if (DECNUMDIGITS<DECIMAL64_Pmax)
+      #error decimal64.h needs pre-defined DECNUMDIGITS>=16 for safe use
+    #endif
+  #endif
+
+
+  #ifndef DECNUMDIGITS
+    #define DECNUMDIGITS DECIMAL64_Pmax /* size if not already defined*/
+  #endif
+  #ifndef DECNUMBER
+    #include "decNumber.h"		/* context and number library */
+  #endif
+
+  /* Decimal 64-bit type, accessible by bytes			      */
+  typedef struct {
+    uint8_t bytes[DECIMAL64_Bytes];	/* decimal64: 1, 5, 8, 50 bits*/
+    } decimal64;
+
+  /* special values [top byte excluding sign bit; last two bits are   */
+  /* don't-care for Infinity on input, last bit don't-care for NaN]   */
+  #if !defined(DECIMAL_NaN)
+    #define DECIMAL_NaN	    0x7c	/* 0 11111 00 NaN	      */
+    #define DECIMAL_sNaN    0x7e	/* 0 11111 10 sNaN	      */
+    #define DECIMAL_Inf	    0x78	/* 0 11110 00 Infinity	      */
+  #endif
+
+  /* ---------------------------------------------------------------- */
+  /* Routines							      */
+  /* ---------------------------------------------------------------- */
+
+  #include "decimal64Symbols.h"
+
+  /* String conversions						      */
+  decimal64 * decimal64FromString(decimal64 *, const char *, decContext *);
+  char * decimal64ToString(const decimal64 *, char *);
+  char * decimal64ToEngString(const decimal64 *, char *);
+
+  /* decNumber conversions					      */
+  decimal64 * decimal64FromNumber(decimal64 *, const decNumber *,
+				  decContext *);
+  decNumber * decimal64ToNumber(const decimal64 *, decNumber *);
+
+  /* Format-dependent utilities					      */
+  uint32_t    decimal64IsCanonical(const decimal64 *);
+  decimal64 * decimal64Canonical(decimal64 *, const decimal64 *);
+
+#endif