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+Potential Incompatibilities with Earlier Versions
+=================================================
+
+This section describes incompatibilities introduced by particular versions of
+SIP.  Normally these are the removal of previously deprecated features.
+
+
+SIP v4.10.1
+-----------
+
+Newly Deprecated Features
+*************************
+
+The following parts of the :ref:`C API <ref-c-api>` are now deprecated (but
+still supported).
+
+- The ``D`` format character of :cfunc:`sipParseResult()`.
+
+
+SIP v4.8
+--------
+
+__truediv__
+***********
+
+Prior to this version the :meth:`__div__` special method implicitly defined the
+:meth:`__truediv__` special method.  From this version the :meth:`__truediv__`
+special method must be explicitly defined.
+
+
+sipWrapper user Member
+**********************
+
+Prior to this version the :ctype:`sipWrapper` structure had a member called
+:ctype:`user` which is available for handwritten code to use.  From this
+version :ctype:`user` is a member of the :ctype:`sipSimpleWrapper` structure.
+
+:ctype:`sipWrapper` pointers can be safely cast to :ctype:`sipSimpleWrapper`
+pointers, so if your code does something like::
+
+    ((sipWrapper *)obj)->user = an_object_reference;
+
+then you just need to change it to::
+
+    ((sipSimpleWrapper *)obj)->user = an_object_reference;
+
+
+Removal of Previously Deprecated Features
+*****************************************
+
+The following parts of the :ref:`C API <ref-c-api>` have been removed.
+
+- The ``a``, ``A``, ``M``, ``N``, ``O``, ``P`` and ``T`` format characters
+  from :cfunc:`sipBuildResult()` and :cfunc:`sipCallMethod()`.
+
+- The ``a``, ``A``, ``L`` and ``M`` format characters from
+  :cfunc:`sipParseResult()`.
+
+- :cfunc:`sipConvertToCpp()`
+
+- :cfunc:`sipIsSubClassInstance()`
+
+- :cfunc:`sipTransfer()`
+
+- The :func:`transfer` function of the :mod:`sip` module.
+
+- The old-style generated type convertors.
+
+In addition the :option:`-a` command line option to :file:`configure.py` has
+been removed.
+
+
+Removal of PyQt-specific Features
+*********************************
+
+The following PyQt-specific support functions have been removed.
+
+- :cfunc:`sipConnectRx()`
+
+- :cfunc:`sipDisconnectRx()`
+
+- :cfunc:`sipEmitSlot()`
+
+- :cfunc:`sipGetSender()`
+
+
+Newly Deprecated Features
+*************************
+
+The following parts of the :ref:`C API <ref-c-api>` are now deprecated (but
+still supported).
+
+- The :ref:`ref-type-objects`.
+
+- The :ref:`ref-enum-type-objects`.
+
+- :cfunc:`sipConvertFromInstance()`
+
+- :cfunc:`sipConvertFromMappedType()`
+
+- :cfunc:`sipConvertFromNamedEnum()`
+
+- :cfunc:`sipConvertFromNewInstance()`
+
+- :cfunc:`sipCanConvertToInstance()`
+
+- :cfunc:`sipCanConvertToMappedType()`
+
+- :cfunc:`sipConvertToInstance()`
+
+- :cfunc:`sipConvertToMappedType()`
+
+- :cfunc:`sipForceConvertToInstance()`
+
+- :cfunc:`sipForceConvertToMappedType()`
+
+- :cfunc:`sipClassName()`
+
+- :cfunc:`sipFindClass()`
+
+- :cfunc:`sipFindNamedEnum()`
+
+- :cfunc:`sipFindMappedType()`
+
+- :cfunc:`sipGetWrapper()`
+
+- :cfunc:`sipReleaseInstance()`
+
+- :cfunc:`sipReleaseMappedType()`
+
+- :cfunc:`sipWrapper_Check()`
+
+- The ``B``, ``C`` and ``E`` format characters of :cfunc:`sipBuildResult()` and
+  :cfunc:`sipCallMethod()`.
+
+- The ``s``, ``C`` and ``E`` format characters of :cfunc:`sipParseResult()`.
+
+
+SIP v4.7.8
+----------
+
+Automatic int to Enum Conversions
+*********************************
+
+This version allows a Python ``int`` object to be passed whenever an enum is
+expected.  This can mean that two signatures that were different with prior
+versions are now the same as far as Python is concerned.
+
+The :aanno:`Constrained` argument annotation can now be applied to an enum
+argument to revert to the earlier behaviour.
+
+
+SIP v4.7.3
+----------
+
+Complementary Comparison Operators
+**********************************
+
+Prior to this version SIP did not automatically generate missing complementary
+comparison operators.  Typically this was worked around by adding them
+explicitly to the .sip files, even though they weren't implemented in C++ and
+relied on the C++ compiler calling the complementary operator that was
+implemented.
+
+A necessary change to the code generator meant that this not longer worked and
+so SIP was changed to automatically generate any missing complementary
+operators.  If you have added such operators explicitly then you should remove
+them or make them dependent on the particular version of SIP.
+
+
+SIP v4.4
+--------
+
+%ConvertFromTypeCode and %ConvertToTypeCode
+*******************************************
+
+Handwritten :directive:`%ConvertFromTypeCode` and
+:directive:`%ConvertToTypeCode` now have the responsibility for implementing
+the :aanno:`Transfer` and :aanno:`TransferBack` annotations.
+
+
+SIP_BUILD
+*********
+
+The :cmacro:`SIP_BUILD` C preprocessor symbol has been removed.
+
+
+Newly Deprecated Features
+*************************
+
+The following parts of the :ref:`C API <ref-c-api>` are now deprecated (but
+still supported).
+
+- The old-style generated type convertors.
+
+- :cfunc:`sipConvertToCpp()`
+
+- :cfunc:`sipIsSubClassInstance()`