This fixes compilation, provided the executable is linked to libobjc (-lobjc should be added to ninja patch),
however at least on 10.6.8 it returns then 0.0.0 for the OS version. Still, may be useful for some macOS, keep it.

--- bee.lua/bee/platform/version.cpp
+++ bee.lua/bee/platform/version.cpp	2025-08-08 02:36:23.000000000 +0800
@@ -2,6 +2,10 @@
 
 #if defined(__APPLE__)
 #    include <objc/message.h>
+#    include <objc/objc.h>
+#    include <objc/runtime.h>
+#    include <cstring>
+#    include <cstdio>
 #else
 #    if defined(_WIN32)
 #        include <Windows.h>
@@ -71,27 +75,35 @@
     version os_version() {
 #if defined(__APPLE__)
         // id processInfo = [NSProcessInfo processInfo]
-        id processInfo = reinterpret_cast<id (*)(Class, SEL)>(objc_msgSend)(objc_getClass("NSProcessInfo"), sel_getUid("processInfo"));
+        id processInfo = ((id (*)(id, SEL))objc_msgSend)(
+            objc_getClass("NSProcessInfo"),
+            sel_getUid("processInfo")
+        );
         if (!processInfo) {
-            return { 0, 0, 0 };
+            return {0, 0, 0};
         }
-        struct OSVersion {
-            int64_t major_version;
-            int64_t minor_version;
-            int64_t patch_version;
-        };
-#    if defined(_M_ARM64) || defined(__aarch64__)
-#        define msgSend objc_msgSend
-#    else
-#        define msgSend objc_msgSend_stret
-#    endif
-        // NSOperatingSystemVersion version = [processInfo operatingSystemVersion]
-        OSVersion version = reinterpret_cast<OSVersion (*)(id, SEL)>(msgSend)(processInfo, sel_getUid("operatingSystemVersion"));
-        return {
-            static_cast<uint32_t>(version.major_version),
-            static_cast<uint32_t>(version.minor_version),
-            static_cast<uint32_t>(version.patch_version)
-        };
+        // id versionStringObj = [processInfo operatingSystemVersionString]
+        SEL versionSel = sel_getUid("operatingSystemVersionString");
+        id versionStringObj = ((id (*)(id, SEL))objc_msgSend)(processInfo, versionSel);
+        if (!versionStringObj) {
+            return {0, 0, 0};
+        }
+        // Check if respondsToSelector:UTF8String
+        SEL utf8Sel = sel_getUid("UTF8String");
+        if (!class_respondsToSelector(object_getClass(versionStringObj), utf8Sel)) {
+            return {0, 0, 0};
+        }
+        const char* versionCString = ((const char* (*)(id, SEL))objc_msgSend)(versionStringObj, utf8Sel);
+        if (!versionCString) {
+            return {0, 0, 0};
+        }
+        unsigned major = 0, minor = 0, patch = 0;
+        const char* ver = std::strstr(versionCString, "Version ");
+        if (ver) {
+            ver += 8;
+            std::sscanf(ver, "%u.%u.%u", &major, &minor, &patch);
+        }
+        return {major, minor, patch};
 #elif defined(_WIN32)
         OSVERSIONINFOW osvi      = {};
         osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOW);