diff --git a/lang/m2/libm2/Mathlib.def b/lang/m2/libm2/Mathlib.def
index d860673f3..ba595831c 100644
--- a/lang/m2/libm2/Mathlib.def
+++ b/lang/m2/libm2/Mathlib.def
@@ -26,46 +26,84 @@ DEFINITION MODULE Mathlib;
 
   PROCEDURE pow(x: REAL; i: INTEGER): REAL;
 
+  PROCEDURE longpow(x: LONGREAL; i: INTEGER): LONGREAL;
+
   PROCEDURE sqrt(x: REAL): REAL;
 
+  PROCEDURE longsqrt(x: LONGREAL): LONGREAL;
+
   PROCEDURE exp(x: REAL): REAL;
 
+  PROCEDURE longexp(x: LONGREAL): LONGREAL;
+
   PROCEDURE ln(x: REAL): REAL;	(* natural log *)
 
+  PROCEDURE longln(x: LONGREAL): LONGREAL;	(* natural log *)
+
   PROCEDURE log(x: REAL): REAL;	(* log with base 10 *)
 
+  PROCEDURE longlog(x: LONGREAL): LONGREAL;	(* log with base 10 *)
+
   (* trigonometric functions; arguments in radians *)
 
   PROCEDURE sin(x: REAL): REAL;
 
+  PROCEDURE longsin(x: LONGREAL): LONGREAL;
+
   PROCEDURE cos(x: REAL): REAL;
 
+  PROCEDURE longcos(x: LONGREAL): LONGREAL;
+
   PROCEDURE tan(x: REAL): REAL;
 
+  PROCEDURE longtan(x: LONGREAL): LONGREAL;
+
   PROCEDURE arcsin(x: REAL): REAL;
 
+  PROCEDURE longarcsin(x: LONGREAL): LONGREAL;
+
   PROCEDURE arccos(x: REAL): REAL;
 
+  PROCEDURE longarccos(x: LONGREAL): LONGREAL;
+
   PROCEDURE arctan(x: REAL): REAL;
 
+  PROCEDURE longarctan(x: LONGREAL): LONGREAL;
+
   (* hyperbolic functions *)
 
   PROCEDURE sinh(x: REAL): REAL;
 
+  PROCEDURE longsinh(x: LONGREAL): LONGREAL;
+
   PROCEDURE cosh(x: REAL): REAL;
 
+  PROCEDURE longcosh(x: LONGREAL): LONGREAL;
+
   PROCEDURE tanh(x: REAL): REAL;
 
+  PROCEDURE longtanh(x: LONGREAL): LONGREAL;
+
   PROCEDURE arcsinh(x: REAL): REAL;
 
+  PROCEDURE longarcsinh(x: LONGREAL): LONGREAL;
+
   PROCEDURE arccosh(x: REAL): REAL;
 
+  PROCEDURE longarccosh(x: LONGREAL): LONGREAL;
+
   PROCEDURE arctanh(x: REAL): REAL;
 
+  PROCEDURE longarctanh(x: LONGREAL): LONGREAL;
+
   (* conversions *)
 
   PROCEDURE RadianToDegree(x: REAL): REAL;
 
+  PROCEDURE longRadianToDegree(x: LONGREAL): LONGREAL;
+
   PROCEDURE DegreeToRadian(x: REAL): REAL;
 
+  PROCEDURE longDegreeToRadian(x: LONGREAL): LONGREAL;
+
 END Mathlib.
diff --git a/lang/m2/libm2/RealConver.def b/lang/m2/libm2/RealConver.def
index e97083627..8aa326143 100644
--- a/lang/m2/libm2/RealConver.def
+++ b/lang/m2/libm2/RealConver.def
@@ -16,6 +16,10 @@ DEFINITION MODULE RealConversions;
      Input terminates with a blank or any control character.
   *)
 
+  PROCEDURE StringToLongReal(str: ARRAY OF CHAR;
+			     VAR r: LONGREAL;
+			     VAR ok: BOOLEAN);
+
   PROCEDURE RealToString(r: REAL;
 			 digits, width: INTEGER;
 			 VAR str: ARRAY OF CHAR;
@@ -29,4 +33,9 @@ DEFINITION MODULE RealConversions;
      If the representation does not fit in "width", then ok is set to FALSE.
   *)
 
+  PROCEDURE LongRealToString(r: LONGREAL;
+			 digits, width: INTEGER;
+			 VAR str: ARRAY OF CHAR;
+			 VAR ok: BOOLEAN);
+
 END RealConversions.