diff -urN xgrk-1.6.3/xgrk.c xgrk-1.6.3-new/xgrk.c
--- xgrk-1.6.3/xgrk.c	2001-03-19 13:44:07.000000000 -0500
+++ xgrk-1.6.3-new/xgrk.c	2010-12-08 17:19:46.695522517 -0500
@@ -18,7 +18,7 @@
 #include <signal.h>
 #include <unistd.h>
 #include <fcntl.h>
-
+#inlcude <string.h>
 #include "xgrk_uk.xpm"
 #include "xgrk_el.xpm"
 
@@ -201,7 +201,7 @@
       perror("gethostname");
       exit(errno);
     }
-    sprintf(buff,"%s/.xgrk-%s",getenv("HOME"),hostname);
+    snprintf(buff,sizeof buff,"%s/.xgrk-%s",getenv("HOME"),hostname);
     sfd=open(buff,O_WRONLY|O_CREAT, 0644);
     if (!sfd) {
       perror(buff);
@@ -217,7 +217,7 @@
       perror("gethostname");
       exit(errno);
     }
-    sprintf(buff,"%s/.xgrk-%s",getenv("HOME"),hostname);
+    snprintf(buff,sizeof buff,"%s/.xgrk-%s",getenv("HOME"),hostname);
     sfd=open(buff,O_RDONLY);
     if (!sfd) {
       perror(buff);
@@ -351,7 +351,7 @@
 	  keycode = -kc;
 	}
 
-      memcpy (prev_keymap, cur_keymap, 32);
+      memmove (prev_keymap, cur_keymap, 32);
     }
     if (keycode==control_l) {	/*switch to Latin to get Ctrl characters*/
       if (state>=0) { 
@@ -490,7 +490,7 @@
     if (count == 0) {
       tmp = XKeysymToString (ks);
       if (tmp)
-	strcpy (key_buff, tmp);
+	strncpy (key_buff, tmp, sizeof(key_buff));
       else
 	key_buff[0] = 0;
     }
@@ -552,10 +552,10 @@
     exit (errno);
   }
 
-  memcpy (greek_plain_ks, original_ks, keycode_size);
-  memcpy (greek_accent_ks, original_ks, keycode_size);
-  memcpy (greek_diaeresis_ks, original_ks, keycode_size);
-  memcpy (greek_diaeresis_accent_ks, original_ks, keycode_size);
+  memmove (greek_plain_ks, original_ks, keycode_size);
+  memmove (greek_accent_ks, original_ks, keycode_size);
+  memmove (greek_diaeresis_ks, original_ks, keycode_size);
+  memmove (greek_diaeresis_accent_ks, original_ks, keycode_size);
 
   for (i = 0; i < sizeof(letters); i++) {
     keycode = greek_plain[i][0];	/* keycodes are the same in all tables*/