--- a/generic/sigproc2.c	2023-01-16 08:03:06.605091947 +0100
+++ b/generic/sigproc2.c	2023-01-16 08:11:03.641089339 +0100
@@ -465,9 +465,7 @@
 }
 
 /*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
-int get_window(dout, n, type)
-     register double *dout;
-     register int n;
+int get_window(register double *dout, register int n, int type)
 {
   static short *din = NULL;
   static int n0 = 0;
@@ -506,9 +504,7 @@
 }
 
 /*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
-int get_float_window(fout, n, type)
-     register float *fout;
-     register int n;
+int get_float_window(register float *fout, register int n, int type)
 {
   static int n0 = 0;
   static double *dout = NULL;
@@ -533,10 +529,7 @@
 }
 
 /*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
-int fwindow(din, dout, n, preemp, type)
-     register short *din;
-     register float *dout, preemp;
-     register int n;
+int fwindow(register short *din, register float *dout, register int n, register float preemp, int type)
 {
   static float *fwind=NULL;
   static int size=0, otype= (-100);
@@ -572,10 +565,7 @@
   
 /*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
 /* same as fwindow() but input is float */
-int fwindow_f(din, dout, n, preemp, type)
-     register float *din;
-     register float *dout, preemp;
-     register int n;
+int fwindow_f(register float *din, register float *dout, register int n, register float preemp, int type)
 {
   static float *fwind=NULL;
   static int size=0, otype= (-100);
@@ -611,10 +601,7 @@
   
 /*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
 /* same as fwindow() but I/O is double */
-int fwindow_d(din, dout, n, preemp, type)
-     register double *din;
-     register double *dout, preemp;
-     register int n;
+int fwindow_d(register double *din, register double *dout, register int n, register double preemp, int type)
 {
   static float *fwind=NULL;
   static int size=0, otype= (-100);
@@ -651,10 +638,7 @@
 
 
 /*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
-void w_window(din, dout, n, preemp, type)
-     register short *din;
-     register double *dout, preemp;
-     register int n;
+void w_window(register short *din, register double *dout, register int n, register double preemp, int type)
 {
   switch(type) {
   case 0:
--- a/generic/jkCanvSpeg.c	2023-01-16 08:25:51.880415841 +0100
+++ b/generic/jkCanvSpeg.c	2023-01-16 08:26:43.667561725 +0100
@@ -92,7 +92,7 @@
 			 Tk_Window tkwin, CONST84 char *value, char *recordPtr,
 			 int offset);
 
-static char *PrintColorMap(ClientData clientData, Tk_Window tkwin,
+static const char *PrintColorMap(ClientData clientData, Tk_Window tkwin,
 			   char *recordPtr, int offset,
 			   Tcl_FreeProc **freeProcPtr);
 
@@ -1797,7 +1797,7 @@
   return TCL_OK;
 }
 
-static char*
+static const char*
 PrintColorMap(ClientData clientData, Tk_Window tkwin, char *recordPtr,
 	      int offset, Tcl_FreeProc **freeProcPtr)
 {