--- src/mongo/util/concurrency/thread_name.cpp	2023-06-16 20:55:56
+++ src/mongo/util/concurrency/thread_name.cpp	2026-03-21 08:23:56
@@ -37,6 +37,7 @@
 #include <pthread.h>
 #endif
 #if defined(__APPLE__)
+#include <AvailabilityMacros.h>
 #include <TargetConditionals.h>
 #if !TARGET_OS_TV && !TARGET_OS_IOS && !TARGET_OS_WATCH
 #include <sys/proc_info.h>
@@ -98,7 +99,7 @@
     // Naming should not be expensive compared to thread creation and connection set up, but if
     // testing shows otherwise we should make this depend on DEBUG again.
     setWindowsThreadName(GetCurrentThreadId(), threadName.c_str());
-#elif defined(__APPLE__)
+#elif defined(__APPLE__) && (MAC_OS_X_VERSION_MIN_REQUIRED >= 1060)
     // Maximum thread name length on OS X is MAXTHREADNAMESIZE (64 characters). This assumes
     // OS X 10.6 or later.
     std::string threadNameCopy = threadName;