diff -ur ice-3.6.3/python/modules/IcePy/Operation.cpp ice-3.6.3-gcc11/python/modules/IcePy/Operation.cpp
--- ice-3.6.3/python/modules/IcePy/Operation.cpp	2016-10-05 16:59:08.000000000 +0200
+++ ice-3.6.3-gcc11/python/modules/IcePy/Operation.cpp	2021-10-17 22:55:04.065560566 +0200
@@ -1682,7 +1682,7 @@
             }
             else
             {
-                if(PyTuple_SET_ITEM(results.get(), info->pos, Unset) < 0)
+                if(PyTuple_SET_ITEM(results.get(), info->pos, Unset) != 0)
                 {
                     return 0;
                 }
@@ -2546,7 +2546,7 @@
             throwPythonException();
         }
 
-        if(PyTuple_SET_ITEM(result.get(), 0, ok ? incTrue() : incFalse()) < 0)
+        if(PyTuple_SET_ITEM(result.get(), 0, ok ? incTrue() : incFalse()) != 0)
         {
             throwPythonException();
         }
@@ -2586,7 +2586,7 @@
         }
 #endif
 
-        if(PyTuple_SET_ITEM(result.get(), 1, op.get()) < 0)
+        if(PyTuple_SET_ITEM(result.get(), 1, op.get()) != 0)
         {
             throwPythonException();
         }
@@ -2827,7 +2827,7 @@
             return 0;
         }
 
-        if(PyTuple_SET_ITEM(args.get(), 0, ok ? incTrue() : incFalse()) < 0)
+        if(PyTuple_SET_ITEM(args.get(), 0, ok ? incTrue() : incFalse()) != 0)
         {
             return 0;
         }
@@ -2867,7 +2867,7 @@
         memcpy(buf, results.first, sz);
 #endif
 
-        if(PyTuple_SET_ITEM(args.get(), 1, op.get()) < 0)
+        if(PyTuple_SET_ITEM(args.get(), 1, op.get()) != 0)
         {
             return 0;
         }
@@ -2910,7 +2910,7 @@
             return;
         }
 
-        if(PyTuple_SET_ITEM(args.get(), 0, ok ? incTrue() : incFalse()) < 0)
+        if(PyTuple_SET_ITEM(args.get(), 0, ok ? incTrue() : incFalse()) != 0)
         {
             assert(PyErr_Occurred());
             PyErr_Print();
@@ -2958,7 +2958,7 @@
         memcpy(buf, results.first, sz);
 #endif
 
-        if(PyTuple_SET_ITEM(args.get(), 1, op.get()) < 0)
+        if(PyTuple_SET_ITEM(args.get(), 1, op.get()) != 0)
         {
             assert(PyErr_Occurred());
             PyErr_Print();
@@ -3126,7 +3126,7 @@
             return;
         }
 
-        if(PyTuple_SET_ITEM(args.get(), 0, ok ? incTrue() : incFalse()) < 0)
+        if(PyTuple_SET_ITEM(args.get(), 0, ok ? incTrue() : incFalse()) != 0)
         {
             assert(PyErr_Occurred());
             PyErr_Print();
@@ -3174,7 +3174,7 @@
         memcpy(buf, results.first, sz);
 #endif
 
-        if(PyTuple_SET_ITEM(args.get(), 1, op.get()) < 0)
+        if(PyTuple_SET_ITEM(args.get(), 1, op.get()) != 0)
         {
             assert(PyErr_Occurred());
             PyErr_Print();
@@ -3302,7 +3302,7 @@
                 }
                 else
                 {
-                    if(PyTuple_SET_ITEM(args.get(), info->pos + offset, Unset) < 0)
+                    if(PyTuple_SET_ITEM(args.get(), info->pos + offset, Unset) != 0)
                     {
                         throwPythonException();
                     }
@@ -3329,7 +3329,7 @@
     // Create an object to represent Ice::Current. We need to append this to the argument tuple.
     //
     PyObjectHandle curr = createCurrent(current);
-    if(PyTuple_SET_ITEM(args.get(), PyTuple_GET_SIZE(args.get()) - 1, curr.get()) < 0)
+    if(PyTuple_SET_ITEM(args.get(), PyTuple_GET_SIZE(args.get()) - 1, curr.get()) != 0)
     {
         throwPythonException();
     }
@@ -3347,7 +3347,7 @@
         }
         obj->upcall = new UpcallPtr(this);
         obj->encoding = current.encoding;
-        if(PyTuple_SET_ITEM(args.get(), 0, (PyObject*)obj) < 0) // PyTuple_SET_ITEM steals a reference.
+        if(PyTuple_SET_ITEM(args.get(), 0, (PyObject*)obj) != 0) // PyTuple_SET_ITEM steals a reference.
         {
             Py_DECREF(obj);
             throwPythonException();
@@ -3698,7 +3698,7 @@
     }
 #endif
 
-    if(PyTuple_SET_ITEM(args.get(), start, ip.get()) < 0)
+    if(PyTuple_SET_ITEM(args.get(), start, ip.get()) != 0)
     {
         throwPythonException();
     }
@@ -3710,7 +3710,7 @@
     // this to the argument tuple.
     //
     PyObjectHandle curr = createCurrent(current);
-    if(PyTuple_SET_ITEM(args.get(), start, curr.get()) < 0)
+    if(PyTuple_SET_ITEM(args.get(), start, curr.get()) != 0)
     {
         throwPythonException();
     }
@@ -3730,7 +3730,7 @@
         }
         obj->upcall = new UpcallPtr(this);
         obj->encoding = current.encoding;
-        if(PyTuple_SET_ITEM(args.get(), 0, (PyObject*)obj) < 0) // PyTuple_SET_ITEM steals a reference.
+        if(PyTuple_SET_ITEM(args.get(), 0, (PyObject*)obj) != 0) // PyTuple_SET_ITEM steals a reference.
         {
             Py_DECREF(obj);
             throwPythonException();