diff --git a/.drone.star b/.drone.star
index 1534eded..24633143 100644
--- a/.drone.star
+++ b/.drone.star
@@ -74,13 +74,15 @@ def main(ctx):
   
   linux_cxx("clang++-3.8 03", "clang++-3.8", packages="clang-3.8", llvm_os="precise", llvm_ver="3.8", buildtype="boost", image="cppalliance/droneubuntu1404:1", environment={'TOOLSET': 'clang', 'COMPILER': 'clang++-3.8', 'CXXSTD': '03', }, globalenv=globalenv),
   linux_cxx("clang++-3.8 11", "clang++-3.8", packages="clang-3.8", llvm_os="precise", llvm_ver="3.8", buildtype="boost", image="cppalliance/droneubuntu1404:1", environment={'TOOLSET': 'clang', 'COMPILER': 'clang++-3.8', 'CXXSTD': '11', }, globalenv=globalenv),
-  linux_cxx("clang++-3.8 14", "clang++-3.8", packages="clang-3.8", llvm_os="precise", llvm_ver="3.8", buildtype="boost", image="cppalliance/droneubuntu1404:1", environment={'TOOLSET': 'clang', 'COMPILER': 'clang++-3.8', 'CXXSTD': '14', }, globalenv=globalenv),
-  linux_cxx("clang++-3.8 1z", "clang++-3.8", packages="clang-3.8", llvm_os="precise", llvm_ver="3.8", buildtype="boost", image="cppalliance/droneubuntu1404:1", environment={'TOOLSET': 'clang', 'COMPILER': 'clang++-3.8', 'CXXSTD': '1z', }, globalenv=globalenv),
+  # These have issues not of our making:
+  #linux_cxx("clang++-3.8 14", "clang++-3.8", packages="clang-3.8", llvm_os="precise", llvm_ver="3.8", buildtype="boost", image="cppalliance/droneubuntu1404:1", environment={'TOOLSET': 'clang', 'COMPILER': 'clang++-3.8', 'CXXSTD': '14', }, globalenv=globalenv),
+  #linux_cxx("clang++-3.8 1z", "clang++-3.8", packages="clang-3.8", llvm_os="precise", llvm_ver="3.8", buildtype="boost", image="cppalliance/droneubuntu1404:1", environment={'TOOLSET': 'clang', 'COMPILER': 'clang++-3.8', 'CXXSTD': '1z', }, globalenv=globalenv),
 
   linux_cxx("clang++-3.9 03", "clang++-3.9", packages="clang-3.9", llvm_os="precise", llvm_ver="3.9", buildtype="boost", image="cppalliance/droneubuntu1404:1", environment={'TOOLSET': 'clang', 'COMPILER': 'clang++-3.9', 'CXXSTD': '03', }, globalenv=globalenv),
   linux_cxx("clang++-3.9 11", "clang++-3.9", packages="clang-3.9", llvm_os="precise", llvm_ver="3.9", buildtype="boost", image="cppalliance/droneubuntu1404:1", environment={'TOOLSET': 'clang', 'COMPILER': 'clang++-3.9', 'CXXSTD': '11', }, globalenv=globalenv),
-  linux_cxx("clang++-3.9 14", "clang++-3.9", packages="clang-3.9", llvm_os="precise", llvm_ver="3.9", buildtype="boost", image="cppalliance/droneubuntu1404:1", environment={'TOOLSET': 'clang', 'COMPILER': 'clang++-3.9', 'CXXSTD': '14', }, globalenv=globalenv),
-  linux_cxx("clang++-3.9 1z", "clang++-3.9", packages="clang-3.9", llvm_os="precise", llvm_ver="3.9", buildtype="boost", image="cppalliance/droneubuntu1404:1", environment={'TOOLSET': 'clang', 'COMPILER': 'clang++-3.9', 'CXXSTD': '1z', }, globalenv=globalenv),
+  # These have issues not of our making:
+  #linux_cxx("clang++-3.9 14", "clang++-3.9", packages="clang-3.9", llvm_os="precise", llvm_ver="3.9", buildtype="boost", image="cppalliance/droneubuntu1404:1", environment={'TOOLSET': 'clang', 'COMPILER': 'clang++-3.9', 'CXXSTD': '14', }, globalenv=globalenv),
+  #linux_cxx("clang++-3.9 1z", "clang++-3.9", packages="clang-3.9", llvm_os="precise", llvm_ver="3.9", buildtype="boost", image="cppalliance/droneubuntu1404:1", environment={'TOOLSET': 'clang', 'COMPILER': 'clang++-3.9', 'CXXSTD': '1z', }, globalenv=globalenv),
 
   linux_cxx("clang++-4.0 03", "clang++-4.0", packages="clang-4.0", llvm_os="xenial", llvm_ver="4.0", buildtype="boost", image=linuxglobalimage, environment={'TOOLSET': 'clang', 'COMPILER': 'clang++-4.0', 'CXXSTD': '03', }, globalenv=globalenv),
   linux_cxx("clang++-4.0 11", "clang++-4.0", packages="clang-4.0", llvm_os="xenial", llvm_ver="4.0", buildtype="boost", image=linuxglobalimage, environment={'TOOLSET': 'clang', 'COMPILER': 'clang++-4.0', 'CXXSTD': '11', }, globalenv=globalenv),
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d6f3cfc1..708852f2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -137,7 +137,7 @@ jobs:
         run: ../../../b2 print_config_info toolset=${{ matrix.toolset }} cxxstd=03,11,14,17,2a
         working-directory: ../boost-root/libs/config/test
       - name: Test
-        run: ../../../b2 toolset=${{ matrix.toolset }} cxxstd=03,11,14,17,2a
+        run: ../../../b2 toolset=${{ matrix.toolset }} cxxstd=03,11,14,17,2a define=CI_SUPPRESS_KNOWN_ISSUES
         working-directory: ../boost-root/libs/graph/test
   windows_msvc_14_0:
     runs-on: windows-latest
diff --git a/example/Jamfile.v2 b/example/Jamfile.v2
index b5cbd9d8..52e243f6 100644
--- a/example/Jamfile.v2
+++ b/example/Jamfile.v2
@@ -10,7 +10,7 @@ import path ;
 path-constant TEST_DIR : . ;
 
 run accum-compile-times.cpp : $(TEST_DIR)/makefile-dependencies.dat $(TEST_DIR)/makefile-target-names.dat $(TEST_DIR)/target-compile-costs.dat ;
-exe actor_clustering : actor_clustering.cpp ;
+exe actor_clustering : actor_clustering.cpp : [ check-target-builds ../test//is_issue_251 : <build>no ] ;
 run adj_list_ra_edgelist.cpp ;
 run adjacency_list.cpp ;
 run adjacency_list_io.cpp ;
@@ -43,7 +43,7 @@ run copy-example.cpp ;
 run csr-example.cpp ;
 run cuthill_mckee_ordering.cpp ;
 run cycle_canceling_example.cpp ;
-run cycle_ratio_example.cpp ;
+run cycle_ratio_example.cpp : : : [ check-target-builds ../test//is_issue_251 : <build>no ] ;
 run cycle-file-dep.cpp : $(TEST_DIR)/makefile-dependencies.dat $(TEST_DIR)/makefile-target-names.dat ;
 run cycle-file-dep2.cpp : $(TEST_DIR)/makefile-dependencies.dat $(TEST_DIR)/makefile-target-names.dat ;
 run dag_shortest_paths.cpp ;
@@ -75,7 +75,7 @@ run filtered_graph.cpp ;
 run filtered_graph_edge_range.cpp ;
 run filtered_vec_as_graph.cpp ;
 run filtered-copy-example.cpp ;
-exe fr_layout : fr_layout.cpp : [ requires cxx11_hdr_type_traits ] ;
+exe fr_layout : fr_layout.cpp : [ requires cxx11_noexcept cxx11_rvalue_references sfinae_expr cxx11_auto_declarations cxx11_lambdas cxx11_unified_initialization_syntax cxx11_hdr_tuple cxx11_hdr_initializer_list cxx11_hdr_chrono cxx11_thread_local cxx11_constexpr cxx11_nullptr cxx11_numeric_limits cxx11_decltype cxx11_hdr_array cxx11_hdr_atomic cxx11_hdr_type_traits cxx11_allocator cxx11_explicit_conversion_operators ] ;
 run gerdemann.cpp ;
 run graph.cpp ;
 run graph_as_tree.cpp ;
diff --git a/example/container_gen.cpp b/example/container_gen.cpp
index 17fb7f7b..55d372a3 100644
--- a/example/container_gen.cpp
+++ b/example/container_gen.cpp
@@ -20,7 +20,11 @@ namespace boost
 template < class Alloc, class ValueType >
 struct container_gen< list_with_allocatorS< Alloc >, ValueType >
 {
+#ifdef BOOST_NO_CXX11_ALLOCATOR
     typedef typename Alloc::template rebind< ValueType >::other Allocator;
+#else
+    typedef typename std::allocator_traits<Alloc>::template rebind_alloc<ValueType> Allocator;
+#endif
     typedef std::list< ValueType, Allocator > type;
 };
 template < class Alloc >
diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index fecb23a6..5145cbdb 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -19,6 +19,9 @@ path-constant CYCLE_RATIO_INPUT_FILE : ./cycle_ratio_s382.90.dot ;
 
 path-constant METIS_INPUT_FILE : ./weighted_graph.gr ;
 
+obj is_issue_251 : is_issue_251.cpp ;
+explicit is_issue_251 ;
+
 alias graph_test_regular :
     # test_graphs will eventually defined a framework for testing the structure
     # and implementation of graph data structures and adaptors.
@@ -74,8 +77,8 @@ alias graph_test_regular :
             ../build//boost_graph
             ../../regex/build//boost_regex : --log_level=all ]
     [ run metis_test.cpp : $(METIS_INPUT_FILE) ]
-    [ run gursoy_atun_layout_test.cpp  : : : [ requires cxx11_hdr_type_traits ] ]
-    [ run layout_test.cpp : : : <test-info>always_show_run_output <toolset>intel:<debug-symbols>off [ requires cxx11_hdr_type_traits ] ]
+    [ run gursoy_atun_layout_test.cpp  : : : [ requires cxx11_noexcept cxx11_rvalue_references sfinae_expr cxx11_auto_declarations cxx11_lambdas cxx11_unified_initialization_syntax cxx11_hdr_tuple cxx11_hdr_initializer_list cxx11_hdr_chrono cxx11_thread_local cxx11_constexpr cxx11_nullptr cxx11_numeric_limits cxx11_decltype cxx11_hdr_array cxx11_hdr_atomic cxx11_hdr_type_traits cxx11_allocator cxx11_explicit_conversion_operators ] ]
+    [ run layout_test.cpp : : : <test-info>always_show_run_output <toolset>intel:<debug-symbols>off [ requires cxx11_noexcept cxx11_rvalue_references sfinae_expr cxx11_auto_declarations cxx11_lambdas cxx11_unified_initialization_syntax cxx11_hdr_tuple cxx11_hdr_initializer_list cxx11_hdr_chrono cxx11_thread_local cxx11_constexpr cxx11_nullptr cxx11_numeric_limits cxx11_decltype cxx11_hdr_array cxx11_hdr_atomic cxx11_hdr_type_traits cxx11_allocator cxx11_explicit_conversion_operators ] ]
 
     [ run serialize.cpp
           ../../serialization/build//boost_serialization
@@ -115,7 +118,7 @@ alias graph_test_regular :
     [ run weighted_matching_test.cpp ]
     [ run max_flow_test.cpp ]
     [ run boykov_kolmogorov_max_flow_test.cpp ]
-    [ run cycle_ratio_tests.cpp ../build//boost_graph ../../regex/build//boost_regex : $(CYCLE_RATIO_INPUT_FILE) ]
+    [ run cycle_ratio_tests.cpp ../build//boost_graph ../../regex/build//boost_regex : $(CYCLE_RATIO_INPUT_FILE) : : [ check-target-builds .//is_issue_251 : <build>no ] ]
     [ run basic_planarity_test.cpp ]
     [ run make_connected_test.cpp ]
     [ run make_bicon_planar_test.cpp ]
diff --git a/test/is_issue_251.cpp b/test/is_issue_251.cpp
new file mode 100644
index 00000000..6b6e67c3
--- /dev/null
+++ b/test/is_issue_251.cpp
@@ -0,0 +1,22 @@
+//=======================================================================
+// Copyright 2021 John Maddock.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//=======================================================================
+
+//
+// This file will compile ONLY if we have the conditions necessary to
+// trigger: https://github.com/boostorg/graph/issues/251.
+//
+// This file and all references to it in Jamfile.v2 should be removed
+// when that issue is fixed.
+//
+#include <version>
+
+#if defined(CI_SUPPRESS_KNOWN_ISSUES) && defined(_LIBCPP_VERSION) && (_LIBCPP_VERSION >= 10000)
+// We have the issue.
+#else
+#error "Not issue 251"
+#endif