diff --git a/libcxx/docs/Status/SpaceshipProjects.csv b/libcxx/docs/Status/SpaceshipProjects.csv
--- a/libcxx/docs/Status/SpaceshipProjects.csv
+++ b/libcxx/docs/Status/SpaceshipProjects.csv
@@ -95,8 +95,8 @@
 | `multimap <https://reviews.llvm.org/D145976>`_",[expos.only.func],Hristo Hristov,|Complete|
 | `[associative.set.syn] <https://wg21.link/associative.set.syn>`_ (`general <https://wg21.link/container.opt.reqmts>`_),"| `multiset <https://reviews.llvm.org/D148416>`_
 | `set <https://reviews.llvm.org/D148416>`_",[expos.only.func],Hristo Hristov,|Complete|
-| `[unord.map.syn] <https://wg21.link/unord.map.syn>`_,"| remove ops `unordered_map`
-| remove ops `unordered_multimap`",None,Unassigned,|Not Started|
+| `[unord.map.syn] <https://wg21.link/unord.map.syn>`_,"| remove ops `unordered_map <https://reviews.llvm.org/D152642>`_
+| remove ops `unordered_multimap <https://reviews.llvm.org/D152642>`_",None,Hristo Hristov,|Complete|
 | `[unordered.set.syn] <https://wg21.link/unordered.set.syn>`_,"| remove ops `unordered_set`
 | remove ops `unordered_multiset`",None,Unassigned,|Not Started|
 | `[queue.syn] <https://wg21.link/queue.syn>`_,| `queue <https://reviews.llvm.org/D146066>`_,None,Hristo Hristov,|Complete|
diff --git a/libcxx/include/unordered_map b/libcxx/include/unordered_map
--- a/libcxx/include/unordered_map
+++ b/libcxx/include/unordered_map
@@ -270,7 +270,7 @@
 template <class Key, class T, class Hash, class Pred, class Alloc>
     bool
     operator!=(const unordered_map<Key, T, Hash, Pred, Alloc>& x,
-               const unordered_map<Key, T, Hash, Pred, Alloc>& y);
+               const unordered_map<Key, T, Hash, Pred, Alloc>& y); // Removed in C++20
 
 template <class Key, class T, class Hash = hash<Key>, class Pred = equal_to<Key>,
           class Alloc = allocator<pair<const Key, T>>>
@@ -508,7 +508,7 @@
 template <class Key, class T, class Hash, class Pred, class Alloc>
     bool
     operator!=(const unordered_multimap<Key, T, Hash, Pred, Alloc>& x,
-               const unordered_multimap<Key, T, Hash, Pred, Alloc>& y);
+               const unordered_multimap<Key, T, Hash, Pred, Alloc>& y); // Removed in C++20
 
 }  // std
 
@@ -954,9 +954,11 @@
     friend _LIBCPP_INLINE_VISIBILITY
         bool operator==(const __hash_map_iterator& __x, const __hash_map_iterator& __y)
         {return __x.__i_ == __y.__i_;}
+#if _LIBCPP_STD_VER <= 17
     friend _LIBCPP_INLINE_VISIBILITY
         bool operator!=(const __hash_map_iterator& __x, const __hash_map_iterator& __y)
         {return __x.__i_ != __y.__i_;}
+#endif
 
     template <class, class, class, class, class> friend class _LIBCPP_TEMPLATE_VIS unordered_map;
     template <class, class, class, class, class> friend class _LIBCPP_TEMPLATE_VIS unordered_multimap;
@@ -1008,9 +1010,11 @@
     friend _LIBCPP_INLINE_VISIBILITY
         bool operator==(const __hash_map_const_iterator& __x, const __hash_map_const_iterator& __y)
         {return __x.__i_ == __y.__i_;}
+#if _LIBCPP_STD_VER <= 17
     friend _LIBCPP_INLINE_VISIBILITY
         bool operator!=(const __hash_map_const_iterator& __x, const __hash_map_const_iterator& __y)
         {return __x.__i_ != __y.__i_;}
+#endif
 
     template <class, class, class, class, class> friend class _LIBCPP_TEMPLATE_VIS unordered_map;
     template <class, class, class, class, class> friend class _LIBCPP_TEMPLATE_VIS unordered_multimap;
@@ -1905,6 +1909,8 @@
     return true;
 }
 
+#if _LIBCPP_STD_VER <= 17
+
 template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
 inline _LIBCPP_INLINE_VISIBILITY
 bool
@@ -1914,6 +1920,8 @@
     return !(__x == __y);
 }
 
+#endif
+
 template <class _Key, class _Tp, class _Hash = hash<_Key>, class _Pred = equal_to<_Key>,
           class _Alloc = allocator<pair<const _Key, _Tp> > >
 class _LIBCPP_TEMPLATE_VIS unordered_multimap
@@ -2619,6 +2627,8 @@
     return true;
 }
 
+#if _LIBCPP_STD_VER <= 17
+
 template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
 inline _LIBCPP_INLINE_VISIBILITY
 bool
@@ -2628,6 +2638,8 @@
     return !(__x == __y);
 }
 
+#endif
+
 _LIBCPP_END_NAMESPACE_STD
 
 #if _LIBCPP_STD_VER >= 17