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-rw-r--r--prolog/sandbox.pl4
1 files changed, 4 insertions, 0 deletions
diff --git a/prolog/sandbox.pl b/prolog/sandbox.pl
index a4f7426..232dc70 100644
--- a/prolog/sandbox.pl
+++ b/prolog/sandbox.pl
@@ -454,3 +454,7 @@ safe_pattr(_, _).
prolog:sandbox_allowed_expansion(G) :-
safe_goal(G).
+
+% tuProlog compatibility
+system:quicksort(L, <, S) :- msort(L, S).
+system:quicksort(L, @<, S) :- msort(L, S).