diff --git a/inc/commondefs.h b/inc/commondefs.h
index aab3035..20ba38e 100644
--- a/inc/commondefs.h
+++ b/inc/commondefs.h
@@ -3,6 +3,4 @@
 void stab(void);
 void warn(const char *s);
 int error(const char *s);
-int stackcheck(void);
-void stackoverflow(void);
 #endif
diff --git a/src/common.c b/src/common.c
index 486bcce..94d85be 100644
--- a/src/common.c
+++ b/src/common.c
@@ -141,39 +141,3 @@ uraidloop:
 
 void warn(const char *s)
 { printf("\nWARN: %s \n", s); }
-
-/*****************************************************************
-stackcheck
-
-        common sub-routine.
-
-        Not Implemented.
-
-        1.check Stack overflow.
-                (check CurrentStackPTR)
-        2.if overflow, return T (not 0).
-          Otherwise, return F (0).
-******************************************************************/
-int stackcheck() {
-#ifdef TRACE2
-  printf("TRACE:stackcheck()\n");
-#endif
-  return (0);
-}
-
-/*****************************************************************
-stackoverflow
-
-        common sub-routine.
-
-        Not Implemented.
-
-        1.error handling of stack overflow.
-******************************************************************/
-
-void stackoverflow() {
-#ifdef TRACE2
-  printf("TRACE:stackoverflow()\n");
-#endif
-  printf("stackoverflow \n");
-}