--- config.h.in
+++ config.h.in
@@ -1806,9 +1806,16 @@
 /* Define to 1 to make NetBSD features available. MINIX 3 needs this. */
 #undef _NETBSD_SOURCE
 
+/* https://clang.llvm.org/docs/LanguageExtensions.html */
+#ifndef __has_attribute         // Optional of course.
+# define __has_attribute(x) 0   // Compatibility non-clang compilers.
+#endif
+
 /* The _Noreturn keyword of C11.  */
 #ifndef _Noreturn
-# if (defined __cplusplus \
+# if defined(__APPLE__) && defined(__clang__) && (__has_attribute(__noreturn__) == 1)
+   /* Don't do anything. Stay out of code paths below. */
+# elif (defined __cplusplus \
       && ((201103 <= __cplusplus && !(__GNUC__ == 4 && __GNUC_MINOR__ == 7)) \
           || (defined _MSC_VER && 1900 <= _MSC_VER)))
 #  define _Noreturn [[noreturn]]
--- src/gl/_Noreturn.h
+++ src/gl/_Noreturn.h
@@ -14,8 +14,15 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
+/* https://clang.llvm.org/docs/LanguageExtensions.html */
+#ifndef __has_attribute         // Optional of course.
+# define __has_attribute(x) 0   // Compatibility non-clang compilers.
+#endif
+
 #ifndef _Noreturn
-# if (defined __cplusplus \
+# if defined(__APPLE__) && defined(__clang__) && (__has_attribute(__noreturn__) == 1)
+   /* Don't do anything. Stay out of code paths below. */
+# elif (defined __cplusplus \
       && ((201103 <= __cplusplus && !(__GNUC__ == 4 && __GNUC_MINOR__ == 7)) \
           || (defined _MSC_VER && 1900 <= _MSC_VER)))
 #  define _Noreturn [[noreturn]]