diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..2f2f06a
Binary files /dev/null and b/.DS_Store differ
diff --git a/Make.engine b/Make.engine
index 2e48330..85db39c 100644
--- a/Make.engine
+++ b/Make.engine
@@ -89,6 +89,6 @@ ops/abCOpSinh.o: ops/abCOp.h abCError.h abCStack.h expr/abCExpr.h expr/abCExpRea
 ops/abCOpCosh.o: ops/abCOp.h abCError.h abCStack.h expr/abCExpr.h expr/abCExpReal.h ops/abCOpCosh.h
 ops/abCOpTanh.o: ops/abCOp.h abCError.h abCStack.h expr/abCExpr.h expr/abCExpReal.h ops/abCOpTanh.h
 ops/abCOpClear.o: ops/abCOp.h abCStack.h ops/abCOpClear.h
-ops/abCOpR2B.o: ops/abCOp.h abCStack.h abCError.h expr/abCExpr.h expr/abCExpReal.h expr/abCExprInt.h ops/abCOp.h ops/abCOpR2B.h
-ops/abCOpB2R.o: ops/abCOp.h abCStack.h abCError.h expr/abCExpr.h expr/abCExpReal.h expr/abCExprInt.h ops/abCOp.h ops/abCOpB2R.h
+ops/abCOpR2B.o: ops/abCOp.h abCStack.h abCError.h expr/abCExpr.h expr/abCExpReal.h expr/abCExprInt.h ops/abCOpR2B.h
+ops/abCOpB2R.o: ops/abCOp.h abCStack.h abCError.h expr/abCExpr.h expr/abCExpReal.h expr/abCExprInt.h ops/abCOpB2R.h