diff --git a/libcxx/include/numbers b/libcxx/include/numbers
--- a/libcxx/include/numbers
+++ b/libcxx/include/numbers
@@ -60,7 +60,7 @@
 
 #include <__config>
 
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER > 17 && defined(__cpp_concepts) && __cpp_concepts >= 201811L
 
 #include <type_traits>
 #include <version>
@@ -136,6 +136,6 @@
 
 _LIBCPP_POP_MACROS
 
-#endif //_LIBCPP_STD_VER > 17
+#endif //_LIBCPP_STD_VER > 17 && defined(__cpp_concepts) && __cpp_concepts >= 201811L
 
 #endif // _LIBCPP_NUMBERS
diff --git a/libcxx/test/std/numerics/numbers/defined.pass.cpp b/libcxx/test/std/numerics/numbers/defined.pass.cpp
--- a/libcxx/test/std/numerics/numbers/defined.pass.cpp
+++ b/libcxx/test/std/numerics/numbers/defined.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+// UNSUPPORTED: libcpp-no-concepts
 
 #include <numbers>
 
diff --git a/libcxx/test/std/numerics/numbers/illformed.verify.cpp b/libcxx/test/std/numerics/numbers/illformed.verify.cpp
--- a/libcxx/test/std/numerics/numbers/illformed.verify.cpp
+++ b/libcxx/test/std/numerics/numbers/illformed.verify.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+// UNSUPPORTED: libcpp-no-concepts
 
 #include <numbers>
 
diff --git a/libcxx/test/std/numerics/numbers/specialize.pass.cpp b/libcxx/test/std/numerics/numbers/specialize.pass.cpp
--- a/libcxx/test/std/numerics/numbers/specialize.pass.cpp
+++ b/libcxx/test/std/numerics/numbers/specialize.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+// UNSUPPORTED: libcpp-no-concepts
 
 #include <cassert>
 #include <numbers>
diff --git a/libcxx/test/std/numerics/numbers/user_type.pass.cpp b/libcxx/test/std/numerics/numbers/user_type.pass.cpp
--- a/libcxx/test/std/numerics/numbers/user_type.pass.cpp
+++ b/libcxx/test/std/numerics/numbers/user_type.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+// UNSUPPORTED: libcpp-no-concepts
 
 #include <numbers>
 
diff --git a/libcxx/test/std/numerics/numbers/value.pass.cpp b/libcxx/test/std/numerics/numbers/value.pass.cpp
--- a/libcxx/test/std/numerics/numbers/value.pass.cpp
+++ b/libcxx/test/std/numerics/numbers/value.pass.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+// UNSUPPORTED: libcpp-no-concepts
 
 #include <cassert>
 #include <numbers>