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diff --git a/libraries/openieee/math_real.vhdl b/libraries/openieee/math_real.vhdl
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+--  This -*- vhdl -*- file is part of GHDL.
+--  IEEE 1076.2 math_real package.
+--  Copyright (C) 2015 Tristan Gingold
+--
+--  GHDL 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 2, or (at your option) any later
+--  version.
+--
+--  GHDL 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.
+--
+--  You should have received a copy of the GNU General Public License
+--  along with GCC; see the file COPYING2.  If not see
+--  <http://www.gnu.org/licenses/>.
+
+package MATH_REAL is
+  constant math_pi : real := 3.14159_26535_89793_23846;
+  function SIGN (X : REAL) return REAL;
+
+  function CEIL (X : REAL) return REAL;
+  attribute foreign of ceil : function is "VHPIDIRECT ceil";
+
+  function FLOOR (X : REAL) return REAL;
+  attribute foreign of floor : function is "VHPIDIRECT floor";
+
+  function ROUND (X : REAL) return REAL;
+  attribute foreign of round : function is "VHPIDIRECT round";
+
+  function TRUNC (X : REAL) return REAL;
+  attribute foreign of trunc : function is "VHPIDIRECT trunc";
+
+  procedure UNIFORM (SEED1, SEED2 : inout POSITIVE; X : out REAL);
+  --  Algorithm from: Pierre L'Ecuyer, CACM June 1988 Volume 31 Number 6
+  --  page 747 figure 3.
+
+  function SIN (X : REAL) return REAL;
+  attribute foreign of SIN : function is "VHPIDIRECT sin";
+
+  function COS (X : REAL) return REAL;
+  attribute foreign of COS : function is "VHPIDIRECT cos";
+end MATH_REAL;