The fillFromDirEnt function assigns 0 to entryFlags and knownFlagsMask, but that is not allowed in C++ without the permissive flag, resulting in a compilation error.
Simple fix:
diff --git a/src/corelib/io/qfilesystemengine_unix.cpp b/src/corelib/io/qfilesystemengine_unix.cpp
index 196081eaa2..a2c0c66e02 100644
--- a/src/corelib/io/qfilesystemengine_unix.cpp
+++ b/src/corelib/io/qfilesystemengine_unix.cpp
@@ -505,8 +505,8 @@ void QFileSystemMetaData::fillFromStatBuf(const QT_STATBUF &statBuffer)
 void QFileSystemMetaData::fillFromDirEnt(const QT_DIRENT &entry)
 {
 #if defined(_DEXTRA_FIRST)
-    knownFlagsMask = 0;
-    entryFlags = 0;
+    knownFlagsMask = MetaDataFlags(0);
+    entryFlags = MetaDataFlags(0);
     for (dirent_extra *extra = _DEXTRA_FIRST(&entry); _DEXTRA_VALID(extra, &entry);
          extra = _DEXTRA_NEXT(extra)) {
         if (extra->d_type == _DTYPE_STAT || extra->d_type == _DTYPE_LSTAT) {
 
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