diff -r -U2 gcl.orig/gcl-tk/tkMain.c gcl/gcl-tk/tkMain.c
--- gcl.orig/gcl-tk/tkMain.c	2013-11-11 21:55:48.000000000 +0700
+++ gcl/gcl-tk/tkMain.c	2014-02-05 00:09:38.821981358 +0700
@@ -122,5 +122,5 @@
      char *x;
 {char buf[300] ;
- sprintf("error %s",x);
+ snprintf(buf,300,"error %s",x);
  Tcl_Eval(interp,buf);
  dfprintf(stderr,x);
@@ -207,5 +207,5 @@
     if (Tk_ParseArgv(interp, (Tk_Window) NULL, &argc, (const char **)argv, argTable, 0)
 	    != TCL_OK) {
-	fprintf(stderr, "%s\n", interp->result);
+	fprintf(stderr, "%s\n", Tcl_GetStringResult(interp));
 	exit(1);
     }
@@ -291,5 +291,5 @@
 
     if (Tcl_AppInit(interp) != TCL_OK) {
-	fprintf(stderr, "Tcl_AppInit failed: %s\n", interp->result);
+	fprintf(stderr, "Tcl_AppInit failed: %s\n", Tcl_GetStringResult(interp));
     }
 
@@ -301,5 +301,5 @@
 	code = Tcl_VarEval(interp, "wm geometry . ", geometry, (char *) NULL);
 	if (code != TCL_OK) {
-	    fprintf(stderr, "%s\n", interp->result);
+	    fprintf(stderr, "%s\n", Tcl_GetStringResult(interp));
 	}
     }
@@ -331,5 +331,5 @@
 	    fullName = Tcl_TildeSubst(interp, tcl_RcFileName, &buffer);
 	    if (fullName == NULL) {
-		fprintf(stderr, "%s\n", interp->result);
+		fprintf(stderr, "%s\n", Tcl_GetStringResult(interp));
 	    } else {
 		f = fopen(fullName, "r");
@@ -337,5 +337,5 @@
 		    code = Tcl_EvalFile(interp, fullName);
 		    if (code != TCL_OK) {
-			fprintf(stderr, "%s\n", interp->result);
+			fprintf(stderr, "%s\n", Tcl_GetStringResult(interp));
 		    }
 		    fclose(f);
@@ -372,5 +372,5 @@
     msg = Tcl_GetVar(interp, "errorInfo", TCL_GLOBAL_ONLY);
     if (msg == NULL) {
-	msg = interp->result;
+	msg = Tcl_GetStringResult(interp);
     }
     dfprintf(stderr, "%s\n", msg);
@@ -497,12 +497,11 @@
 	    {
 	      char buf[4];
-	      char *p = buf;
+	      char *p = buf, *string;
 	      /*header */
 	      *p++ = (code ? '1' : '0');
 	      bcopy(msg->msg_id,p,3);
 	      /* end header */
-	      if(sock_write_str2(dsfd, m_reply, buf, 4 ,
-				 interp->result, strlen(interp->result))
-		 < 0)
+	      string = Tcl_GetStringResult(interp);
+	      if(sock_write_str2(dsfd, m_reply, buf, 4, string, strlen(string)) < 0)
 		{		/* what do we want to do if the write failed */}