Index: doxygen-1.9.4/filesystem/filesystem.hpp
===================================================================
--- doxygen-1.9.4.orig/filesystem/filesystem.hpp
+++ doxygen-1.9.4/filesystem/filesystem.hpp
@@ -5548,12 +5548,13 @@ public:
     impl(const path& path, directory_options options)
         : _base(path)
         , _options(options)
-        , _dir(nullptr)
+        , _n(-1)
+	, _name_list(nullptr)
         , _entry(nullptr)
     {
         if (!path.empty()) {
-            _dir = ::opendir(path.native().c_str());
-            if (!_dir) {
+            _n = ::scandir(path.native().c_str(), &_name_list, NULL, alphasort);
+            if (_n == -1) {
                 auto error = errno;
                 _base = filesystem::path();
                 if ((error != EACCES && error != EPERM) || (options & directory_options::skip_permission_denied) == directory_options::none) {
@@ -5568,30 +5569,31 @@ public:
     impl(const impl& other) = delete;
     ~impl()
     {
-        if (_dir) {
-            ::closedir(_dir);
+        if (_name_list) {
+            ::free(_name_list);
         }
     }
     void increment(std::error_code& ec)
     {
-        if (_dir) {
+        if (_name_list) {
             bool skip;
             do {
                 skip = false;
                 errno = 0;
-                _entry = ::readdir(_dir);
-                if (_entry) {
+                if (_n >= 0) {
+                    _entry = _name_list[_n--];
                     _dir_entry._path = _base;
                     _dir_entry._path.append_name(_entry->d_name);
                     copyToDirEntry();
+		    ::free(_entry);
                     if (ec && (ec.value() == EACCES || ec.value() == EPERM) && (_options & directory_options::skip_permission_denied) == directory_options::skip_permission_denied) {
                         ec.clear();
                         skip = true;
                     }
                 }
                 else {
-                    ::closedir(_dir);
-                    _dir = nullptr;
+                    ::free(_name_list);
+                    _name_list = nullptr;
                     _dir_entry._path.clear();
                     if (errno) {
                         ec = detail::make_system_error();
@@ -5634,7 +5636,8 @@ public:
     }
     path _base;
     directory_options _options;
-    DIR* _dir;
+    int _n;
+    struct ::dirent** _name_list;
     struct ::dirent* _entry;
     directory_entry _dir_entry;
     std::error_code _ec;