diff --git a/ChangeLog b/ChangeLog
index cf03bf2a3..5dbc91e54 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2010-07-24  Robert Larice
+ * src/frontend/evaluate.c ,
+ * src/frontend/parse.c ,
+ * src/include/fteext.h ,
+ * src/include/fteparse.h ,
+ * src/maths/cmaths/cmath2.c ,
+ * src/maths/cmaths/cmath2.h :
+    fix the type signature of the cx_* functions
+
 2010-07-23  Robert Larice
   * src/include/smpdefs.h ,
   * src/include/spmatrix.h :
diff --git a/src/frontend/evaluate.c b/src/frontend/evaluate.c
index 48e80c63c..9d6a1b1d7 100644
--- a/src/frontend/evaluate.c
+++ b/src/frontend/evaluate.c
@@ -150,7 +150,7 @@ static struct dvec *
 doop(char what,
      void*(*func) (void *data1, void *data2,
 		   short int datatype1, short int datatype2,
-		   int length, ...),
+		   int length),
      struct pnode *arg1,
      struct pnode *arg2)
 {
@@ -845,7 +845,7 @@ apply_func(struct func *func, struct pnode *arg)
 	if (eq(func->fu_name, "interpolate") || eq(func->fu_name, "deriv") || eq(func->fu_name, "group_delay"))       /* Ack */
 	{
 	    void *(*f)(void *data, short int type, int length,
-                       int *newlength, short int *newtype, ...)=func->fu_func;
+                       int *newlength, short int *newtype, struct plot *, struct plot *, int) = (void *(*)(void *, short int, int, int *, short int *, struct plot *, struct plot *, int)) func->fu_func;
             data = ((*f) ((isreal(v) ? (void *) v->v_realdata : (void *) v->v_compdata),
 		          (short) (isreal(v) ? VF_REAL : VF_COMPLEX),
 		          v->v_length, &len, &type,
diff --git a/src/frontend/parse.c b/src/frontend/parse.c
index 9f251d6a8..28672c2f4 100644
--- a/src/frontend/parse.c
+++ b/src/frontend/parse.c
@@ -136,6 +136,8 @@ struct op uops[] = {
  * we do for vm(), etc won't work. This is caught in evaluate(). Bad kludge.
  */
 
+typedef void* cx_function_t(void*,short int,int,int*,short int*);
+
 struct func ft_funcs[] = {
         { "mag",    cx_mag } ,
         { "magnitude",  cx_mag } ,
@@ -162,15 +164,15 @@ struct func ft_funcs[] = {
         { "pos",    cx_pos } ,
         { "mean",   cx_mean } ,
         { "avg",   cx_avg } ,                /* A.Roldan 03/06/05 incremental average new function */
-        { "group_delay",  cx_group_delay } , /* A.Roldan 10/06/05 group delay new function */
+        { "group_delay",  (cx_function_t*) cx_group_delay } , /* A.Roldan 10/06/05 group delay new function */
         { "vector", cx_vector } ,
         { "unitvec",    cx_unitvec } ,
         { "length", cx_length } ,
         { "vecmin", cx_min } ,
         { "vecmax", cx_max } ,
         { "vecd", cx_d } ,
-        { "interpolate", cx_interpolate } ,
-        { "deriv",       cx_deriv } ,
+        { "interpolate", (cx_function_t*) cx_interpolate } ,
+        { "deriv",       (cx_function_t*) cx_deriv } ,
         { "v",      NULL } ,
         { NULL,     NULL }
 } ;
diff --git a/src/include/fteext.h b/src/include/fteext.h
index a3f102f82..6fff6af5d 100644
--- a/src/include/fteext.h
+++ b/src/include/fteext.h
@@ -74,63 +74,64 @@ extern bool clip_to_circle(int *x1, int *y1, int *x2, int *y2, int cx, int cy, i
 /* cmath1.c */
 
 extern bool cx_degrees;
-extern void *cx_mag(void *, short int , int , int *, short int *, ...);
-extern void *cx_ph(void *, short int , int , int *, short int *, ...);
-extern void *cx_j(void *, short int , int , int *, short int *, ...);
-extern void *cx_real(void *, short int , int , int *, short int *, ...);
-extern void *cx_imag(void *, short int , int , int *, short int *, ...);
-extern void *cx_pos(void *, short int , int , int *, short int *, ...);
-extern void *cx_db(void *, short int , int , int *, short int *, ...);
-extern void *cx_log(void *, short int , int , int *, short int *, ...);
-extern void *cx_ln(void *, short int , int , int *, short int *, ...);
-extern void *cx_exp(void *, short int , int , int *, short int *, ...);
-extern void *cx_sqrt(void *, short int , int , int *, short int *, ...);
-extern void *cx_sin(void *, short int , int , int *, short int *, ...);
-extern void *cx_cos(void *, short int , int , int *, short int *, ...);
+extern void *cx_mag(void *, short int , int , int *, short int *);
+extern void *cx_ph(void *, short int , int , int *, short int *);
+extern void *cx_j(void *, short int , int , int *, short int *);
+extern void *cx_real(void *, short int , int , int *, short int *);
+extern void *cx_imag(void *, short int , int , int *, short int *);
+extern void *cx_pos(void *, short int , int , int *, short int *);
+extern void *cx_db(void *, short int , int , int *, short int *);
+extern void *cx_log(void *, short int , int , int *, short int *);
+extern void *cx_ln(void *, short int , int , int *, short int *);
+extern void *cx_exp(void *, short int , int , int *, short int *);
+extern void *cx_sqrt(void *, short int , int , int *, short int *);
+extern void *cx_sin(void *, short int , int , int *, short int *);
+extern void *cx_cos(void *, short int , int , int *, short int *);
 
 /* cmath2.c */
 
-extern void *cx_tan(void *, short int , int , int *, short int *, ...);
-extern void *cx_atan(void *, short int , int , int *, short int *, ...);
-extern void *cx_norm(void *, short int , int , int *, short int *, ...);
-extern void *cx_uminus(void *, short int , int , int *, short int *, ...);
-extern void *cx_rnd(void *, short int , int , int *, short int *, ...);
-extern void *cx_mean(void *, short int , int , int *, short int *, ...);
-extern void *cx_avg(void *, short int , int , int *, short int *, ...);
-extern void *cx_length(void *, short int , int , int *, short int *, ...);
-extern void *cx_vector(void *, short int , int , int *, short int *, ...);
-extern void *cx_unitvec(void *, short int , int , int *, short int *, ...);
+extern void *cx_tan(void *, short int , int , int *, short int *);
+extern void *cx_atan(void *, short int , int , int *, short int *);
+extern void *cx_norm(void *, short int , int , int *, short int *);
+extern void *cx_uminus(void *, short int , int , int *, short int *);
+extern void *cx_rnd(void *, short int , int , int *, short int *);
+extern void *cx_mean(void *, short int , int , int *, short int *);
+extern void *cx_avg(void *, short int , int , int *, short int *);
+extern void *cx_length(void *, short int , int , int *, short int *);
+extern void *cx_vector(void *, short int , int , int *, short int *);
+extern void *cx_unitvec(void *, short int , int , int *, short int *);
  
 /* Routoure JM : somme useful functions */
-extern void *cx_min(void *, short int , int , int *, short int *, ...);
-extern void *cx_max(void *, short int , int , int *, short int *, ...);
-extern void *cx_d(void *, short int , int , int *, short int *, ...);
+extern void *cx_min(void *, short int , int , int *, short int *);
+extern void *cx_max(void *, short int , int , int *, short int *);
+extern void *cx_d(void *, short int , int , int *, short int *);
 
-extern void *cx_plus(void *, void *, short int , short int , int, ...);
-extern void *cx_minus(void *, void *, short int , short int , int, ...);
-extern void *cx_times(void *, void *, short int , short int , int, ...);
-extern void *cx_mod(void *, void *, short int , short int , int, ...);
+extern void *cx_plus(void *, void *, short int , short int , int);
+extern void *cx_minus(void *, void *, short int , short int , int);
+extern void *cx_times(void *, void *, short int , short int , int);
+extern void *cx_mod(void *, void *, short int , short int , int);
 
 /* cmath3.c */
 
-extern void *cx_divide(void *, void *, short int , short int , int, ...);
-extern void *cx_comma(void *, void *, short int , short int , int, ...);
-extern void *cx_power(void *, void *, short int , short int , int, ...);
-extern void *cx_eq(void *, void *, short int , short int , int, ...);
-extern void *cx_gt(void *, void *, short int , short int , int, ...);
-extern void *cx_lt(void *, void *, short int , short int , int, ...);
-extern void *cx_ge(void *, void *, short int , short int , int, ...);
-extern void *cx_le(void *, void *, short int , short int , int, ...);
-extern void *cx_ne(void *, void *, short int , short int , int, ...);
+extern void *cx_divide(void *, void *, short int , short int , int);
+extern void *cx_comma(void *, void *, short int , short int , int);
+extern void *cx_power(void *, void *, short int , short int , int);
+extern void *cx_eq(void *, void *, short int , short int , int);
+extern void *cx_gt(void *, void *, short int , short int , int);
+extern void *cx_lt(void *, void *, short int , short int , int);
+extern void *cx_ge(void *, void *, short int , short int , int);
+extern void *cx_le(void *, void *, short int , short int , int);
+extern void *cx_ne(void *, void *, short int , short int , int);
 
 /* cmath4.c */
 
-extern void *cx_and(void *, void *, short int , short int , int, ...);
-extern void *cx_or(void *, void *, short int , short int , int, ...);
-extern void *cx_not(void *, short int , int , int *, short int * , ...);
-extern void *cx_interpolate(void *, short int , int , int *, short int *, ...); /* struct plot *, struct plot *, int ); */
-extern void *cx_deriv(void *, short int , int , int *, short int *, ...); /*struct plot *, struct plot *, int );*/
-extern void *cx_group_delay(void *, short int , int , int *, short int *, ...); /*struct plot *, struct plot *, int );*/
+extern void *cx_and(void *, void *, short int , short int , int);
+extern void *cx_or(void *, void *, short int , short int , int);
+extern void *cx_not(void *, short int , int , int *, short int *);
+
+extern void *cx_interpolate(void *, short int , int , int *, short int *, struct plot *, struct plot *, int );
+extern void *cx_deriv(void *, short int , int , int *, short int *, struct plot *, struct plot *, int );
+extern void *cx_group_delay(void *, short int , int , int *, short int *, struct plot *, struct plot *, int );
 
 
 /* cmdtab.c */
diff --git a/src/include/fteparse.h b/src/include/fteparse.h
index 18f44c065..38cef77b6 100644
--- a/src/include/fteparse.h
+++ b/src/include/fteparse.h
@@ -43,7 +43,7 @@ struct func {
 
     /* The function. */
     void *(*fu_func)(void *data, short int type, int length,
-		     int *newlength, short int *newtype, ...);
+		     int *newlength, short int *newtype);
 } ;
 
 /* User-definable functions. The idea of ud_name is that the args are
diff --git a/src/maths/cmaths/cmath2.c b/src/maths/cmaths/cmath2.c
index 41b6bde59..dff5af98d 100644
--- a/src/maths/cmaths/cmath2.c
+++ b/src/maths/cmaths/cmath2.c
@@ -75,7 +75,7 @@ c_tan(complex *cc, int length)
 }
 
 void *
-cx_tan(void *data, short int type, int length, int *newlength, short int *newtype, ...)
+cx_tan(void *data, short int type, int length, int *newlength, short int *newtype)
 {
     *newlength = length;
     if (type == VF_REAL) {
@@ -90,7 +90,7 @@ cx_tan(void *data, short int type, int length, int *newlength, short int *newtyp
 
 
 void *
-cx_atan(void *data, short int type, int length, int *newlength, short int *newtype, ...)
+cx_atan(void *data, short int type, int length, int *newlength, short int *newtype)
 {
     double *d;
 
@@ -140,7 +140,7 @@ cx_max_local(void *data, short int type, int length)
 /* Normalize the data so that the magnitude of the greatest value is 1. */
 
 void *
-cx_norm(void *data, short int type, int length, int *newlength, short int *newtype, ...)
+cx_norm(void *data, short int type, int length, int *newlength, short int *newtype)
 {
     double largest = 0.0;
 
@@ -179,7 +179,7 @@ cx_norm(void *data, short int type, int length, int *newlength, short int *newty
 }
 
 void *
-cx_uminus(void *data, short int type, int length, int *newlength, short int *newtype, ...)
+cx_uminus(void *data, short int type, int length, int *newlength, short int *newtype)
 {
     *newlength = length;
     if (type == VF_COMPLEX) {
@@ -208,7 +208,7 @@ cx_uminus(void *data, short int type, int length, int *newlength, short int *new
 }
 
 void *
-cx_rnd(void *data, short int type, int length, int *newlength, short int *newtype, ...)
+cx_rnd(void *data, short int type, int length, int *newlength, short int *newtype)
 {
     *newlength = length;
     checkseed();
@@ -248,7 +248,7 @@ cx_rnd(void *data, short int type, int length, int *newlength, short int *newtyp
    Created by A.M.Roldan 2005-05-21  */
    
 void 
-*cx_avg(void *data, short int type, int length, int *newlength, short int *newtype, ...)
+*cx_avg(void *data, short int type, int length, int *newlength, short int *newtype)
 {
     complex *c;
     double *d = NULL, sum_real = 0.0,sum_imag = 0.0;
@@ -292,7 +292,7 @@ void
 /* Compute the mean of a vector. */
 
 void *
-cx_mean(void *data, short int type, int length, int *newlength, short int *newtype, ...)
+cx_mean(void *data, short int type, int length, int *newlength, short int *newtype)
 {
     *newlength = 1;
     rcheck(length > 0, "mean");
@@ -326,7 +326,7 @@ cx_mean(void *data, short int type, int length, int *newlength, short int *newty
 
 
 void *
-cx_length(void *data, short int type, int length, int *newlength, short int *newtype, ...)
+cx_length(void *data, short int type, int length, int *newlength, short int *newtype)
 {
     double *d;
 
@@ -343,7 +343,7 @@ cx_length(void *data, short int type, int length, int *newlength, short int *new
 
 
 void *
-cx_vector(void *data, short int type, int length, int *newlength, short int *newtype, ...)
+cx_vector(void *data, short int type, int length, int *newlength, short int *newtype)
 {
     complex *cc = (complex *) data;
     double *dd = (double *) data;
@@ -368,7 +368,7 @@ cx_vector(void *data, short int type, int length, int *newlength, short int *new
 
 
 void *
-cx_unitvec(void *data, short int type, int length, int *newlength, short int *newtype, ...)
+cx_unitvec(void *data, short int type, int length, int *newlength, short int *newtype)
 {
     complex *cc = (complex *) data;
     double *dd = (double *) data;
@@ -398,7 +398,7 @@ cx_unitvec(void *data, short int type, int length, int *newlength, short int *ne
  */
 
 void *
-cx_plus(void *data1, void *data2, short int datatype1, short int datatype2, int length, ...)
+cx_plus(void *data1, void *data2, short int datatype1, short int datatype2, int length)
 {
     double *dd1 = (double *) data1;
     double *dd2 = (double *) data2;
@@ -438,7 +438,7 @@ cx_plus(void *data1, void *data2, short int datatype1, short int datatype2, int
 }
 
 void *
-cx_minus(void *data1, void *data2, short int datatype1, short int datatype2, int length, ...)
+cx_minus(void *data1, void *data2, short int datatype1, short int datatype2, int length)
 {
     double *dd1 = (double *) data1;
     double *dd2 = (double *) data2;
@@ -478,7 +478,7 @@ cx_minus(void *data1, void *data2, short int datatype1, short int datatype2, int
 }
 
 void *
-cx_times(void *data1, void *data2, short int datatype1, short int datatype2, int length, ...)
+cx_times(void *data1, void *data2, short int datatype1, short int datatype2, int length)
 {
     double *dd1 = (double *) data1;
     double *dd2 = (double *) data2;
@@ -520,7 +520,7 @@ cx_times(void *data1, void *data2, short int datatype1, short int datatype2, int
 }
 
 void *
-cx_mod(void *data1, void *data2, short int datatype1, short int datatype2, int length, ...)
+cx_mod(void *data1, void *data2, short int datatype1, short int datatype2, int length)
 {
     double *dd1 = (double *) data1;
     double *dd2 = (double *) data2;
@@ -579,7 +579,7 @@ cx_mod(void *data1, void *data2, short int datatype1, short int datatype2, int l
 /* Routoure JM : Compute the max of a vector. */
 
 void *
-cx_max(void *data, short int type, int length, int *newlength, short int *newtype, ...)
+cx_max(void *data, short int type, int length, int *newlength, short int *newtype)
 {
     *newlength = 1;
     /* test if length >0 et affiche un message d'erreur */
@@ -620,7 +620,7 @@ cx_max(void *data, short int type, int length, int *newlength, short int *newtyp
 /* Routoure JM : Compute the min of a vector. */
 
 void *
-cx_min(void *data, short int type, int length, int *newlength, short int *newtype, ...)
+cx_min(void *data, short int type, int length, int *newlength, short int *newtype)
 {
     *newlength = 1;
     /* test if length >0 et affiche un message d'erreur */
@@ -663,7 +663,7 @@ cx_min(void *data, short int type, int length, int *newlength, short int *newtyp
 /* Routoure JM : Compute the differential  of a vector. */
 
 void *
-cx_d(void *data, short int type, int length, int *newlength, short int *newtype, ...)
+cx_d(void *data, short int type, int length, int *newlength, short int *newtype)
 {
     *newlength = length;
     /* test if length >0 et affiche un message d'erreur */
diff --git a/src/maths/cmaths/cmath2.h b/src/maths/cmaths/cmath2.h
index cb72d6cf3..16cdf668f 100644
--- a/src/maths/cmaths/cmath2.h
+++ b/src/maths/cmaths/cmath2.h
@@ -7,22 +7,22 @@
 #define CMATH2_H_INCLUDED
 
 
-void * cx_tan(void *data, short int type, int length, int *newlength, short int *newtype, ...);
-void * cx_atan(void *data, short int type, int length, int *newlength, short int *newtype, ...);
-void * cx_norm(void *data, short int type, int length, int *newlength, short int *newtype, ...);
-void * cx_uminus(void *data, short int type, int length, int *newlength, short int *newtype, ...);
-void * cx_rnd(void *data, short int type, int length, int *newlength, short int *newtype, ...);
-void * cx_mean(void *data, short int type, int length, int *newlength, short int *newtype, ...);
-void * cx_length(void *data, short int type, int length, int *newlength, short int *newtype, ...);
-void * cx_vector(void *data, short int type, int length, int *newlength, short int *newtype, ...);
-void * cx_unitvec(void *data, short int type, int length, int *newlength, short int *newtype, ...);
-void * cx_plus(void *data1, void *data2, short int datatype1, short int datatype2, int length, ...);
-void * cx_minus(void *data1, void *data2, short int datatype1, short int datatype2, int length, ...);
-void * cx_times(void *data1, void *data2, short int datatype1, short int datatype2, int length, ...);
-void * cx_mod(void *data1, void *data2, short int datatype1, short int datatype2, int length, ...);
-void * cx_max(void *data, short int type, int length, int *newlength, short int *newtype, ...);
-void * cx_min(void *data, short int type, int length, int *newlength, short int *newtype, ...);
-void * cx_d(void *data, short int type, int length, int *newlength, short int *newtype, ...);
+void * cx_tan(void *data, short int type, int length, int *newlength, short int *newtype);
+void * cx_atan(void *data, short int type, int length, int *newlength, short int *newtype);
+void * cx_norm(void *data, short int type, int length, int *newlength, short int *newtype);
+void * cx_uminus(void *data, short int type, int length, int *newlength, short int *newtype);
+void * cx_rnd(void *data, short int type, int length, int *newlength, short int *newtype);
+void * cx_mean(void *data, short int type, int length, int *newlength, short int *newtype);
+void * cx_length(void *data, short int type, int length, int *newlength, short int *newtype);
+void * cx_vector(void *data, short int type, int length, int *newlength, short int *newtype);
+void * cx_unitvec(void *data, short int type, int length, int *newlength, short int *newtype);
+void * cx_plus(void *data1, void *data2, short int datatype1, short int datatype2, int length);
+void * cx_minus(void *data1, void *data2, short int datatype1, short int datatype2, int length);
+void * cx_times(void *data1, void *data2, short int datatype1, short int datatype2, int length);
+void * cx_mod(void *data1, void *data2, short int datatype1, short int datatype2, int length);
+void * cx_max(void *data, short int type, int length, int *newlength, short int *newtype);
+void * cx_min(void *data, short int type, int length, int *newlength, short int *newtype);
+void * cx_d(void *data, short int type, int length, int *newlength, short int *newtype);
 
 
 #endif