diff --git a/C/c_interface.c b/C/c_interface.c
index 57ed3d60c..3d4341845 100644
--- a/C/c_interface.c
+++ b/C/c_interface.c
@@ -10,8 +10,11 @@
 * File:		c_interface.c						 *
 * comments:	c_interface primitives definition 			 *
 *									 *
-* Last rev:	$Date: 2007-05-14 16:44:11 $,$Author: vsc $						 *
+* Last rev:	$Date: 2007-05-15 11:33:51 $,$Author: vsc $						 *
 * $Log: not supported by cvs2svn $
+* Revision 1.93  2007/05/14 16:44:11  vsc
+* improve external interface
+*
 * Revision 1.92  2007/04/18 23:01:16  vsc
 * fix deadlock when trying to create a module with the same name as a
 * predicate (for now, just don't lock modules). obs Paulo Moura.
@@ -314,7 +317,7 @@ X_API Term    STD_PROTO(YAP_BufferToAtomList, (char *));
 X_API void    STD_PROTO(YAP_Error,(int, Term, char *, ...));
 X_API Term    STD_PROTO(YAP_RunGoal,(Term));
 X_API int     STD_PROTO(YAP_RestartGoal,(void));
-X_API int     STD_PROTO(YAP_ShutdownGoal,(void));
+X_API int     STD_PROTO(YAP_ShutdownGoal,(int));
 X_API int     STD_PROTO(YAP_GoalHasException,(Term *));
 X_API void    STD_PROTO(YAP_ClearExceptions,(void));
 X_API int     STD_PROTO(YAP_ContinueGoal,(void));
@@ -1129,7 +1132,7 @@ YAP_RestartGoal(void)
 }
 
 X_API int
-YAP_ShutdownGoal(void)
+YAP_ShutdownGoal(int backtrack)
 {
   BACKUP_MACHINE_REGS();
   
@@ -1146,11 +1149,14 @@ YAP_ShutdownGoal(void)
 #endif
     /* just force backtrack */
     B = cut_pt;
-    P = FAILCODE;
-    Yap_exec_absmi(TRUE);
-    /* recover stack space */
-    H = cut_pt->cp_h;
-    TR = cut_pt->cp_tr;
+    if (backtrack) {
+      P = FAILCODE;
+      Yap_exec_absmi(TRUE);
+      /* recover stack space */
+      H = cut_pt->cp_h;
+      TR = cut_pt->cp_tr;
+    }
+    /* we can always recover the stack */
     ENV = cut_pt->cp_env;
     ASP = (CELL *)(cut_pt+1);
     ASP += EnvSizeInCells;
diff --git a/C/exec.c b/C/exec.c
index e14d6f8f3..4335f927f 100644
--- a/C/exec.c
+++ b/C/exec.c
@@ -402,12 +402,6 @@ p_execute(void)
   return do_execute(t, CurrentModule);
 }
 
-static int
-Yap_Execute(Term t)
-{				/* '$execute'(Goal)	 */
-  return do_execute(t, CurrentModule);
-}
-
 static void
 heap_store(Term t)
 {
diff --git a/changes-5.1.html b/changes-5.1.html
index ef725f36b..18a1bde25 100644
--- a/changes-5.1.html
+++ b/changes-5.1.html
@@ -16,6 +16,7 @@
 
 <h2>Yap-5.1.2:</h2>
 <ul>
+<li> FIXED: min_list (obs from Angelika, Bernd & Niels).</li>
 <li> FIXED: issues with C-Interface (obs from Trevor Walker).</li>
 <li> FIXED: mktime needs to know if daylight time savings are on
 (obs from Bernd Gutmann).</li>
diff --git a/docs/yap.tex b/docs/yap.tex
index 1398a2448..ce8ac91b8 100644
--- a/docs/yap.tex
+++ b/docs/yap.tex
@@ -12798,11 +12798,12 @@ Look for the next solution to the current query by forcing YAP to
 backtrack to the latest goal. Notice that slots allocated since the last
 @code{YAP_RunGoal} will become invalid.
 
-@item  @code{int} YAP_ShutdownGoal(@code{void})
+@item  @code{int} YAP_ShutdownGoal(@code{int backtrack})
 @findex YAP_ShutdownGoal/0
-Clean up the current goal. All it space should be recovered and any
-pointers to the goal will become invalid. Also notice that slots
-allocated since the goal was started will be invalid.
+Clean up the current goal. If
+@code{backtrack} is true, stack space will be recovered and bindings
+will be undone. In both cases, any slots allocated since the goal was
+created will become invalid.
 
 @item  @code{int} YAP_Reset(@code{void})
 @findex YAP_Reset/0
diff --git a/include/YapInterface.h b/include/YapInterface.h
index 5cf1ac5d9..00d6e9fb4 100644
--- a/include/YapInterface.h
+++ b/include/YapInterface.h
@@ -222,8 +222,8 @@ extern X_API YAP_Term PROTO(YAP_RunGoal,(YAP_Term));
 /*  int YAP_RestartGoal(void) */
 extern X_API YAP_Bool PROTO(YAP_RestartGoal,(void));
 
-/*  int YAP_ShutdownGoal(void) */
-extern X_API YAP_Bool PROTO(YAP_ShutdownGoal,(void));
+/*  int YAP_ShutdownGoal(int) */
+extern X_API YAP_Bool PROTO(YAP_ShutdownGoal,(int));
 
 /*  int YAP_ContinueGoal(void) */
 extern X_API YAP_Bool PROTO(YAP_ContinueGoal,(void));
diff --git a/library/lists.yap b/library/lists.yap
index 96099d0e5..ec3aa4487 100644
--- a/library/lists.yap
+++ b/library/lists.yap
@@ -335,7 +335,7 @@ max_list([H|L],Max0,Max) :-
 	).
 
 min_list([H|L],Max) :-
-	max_list(L,H,Max).
+	min_list(L,H,Max).
 
 min_list([],Max,Max).
 min_list([H|L],Max0,Max) :-