Index: client-2.10.1/src/common/asserts.h
===================================================================
--- client-2.10.1.orig/src/common/asserts.h
+++ client-2.10.1/src/common/asserts.h
@@ -44,7 +44,7 @@
     } else {                                                                                                                \
     }
 
-inline OC_REQUIRED_RESULT bool __OC_ENSURE(bool condition, const char *cond, const char *file, int line, const char *info)
+OC_REQUIRED_RESULT inline bool __OC_ENSURE(bool condition, const char *cond, const char *file, int line, const char *info)
 {
     if (Q_UNLIKELY(!condition)) {
         OC_ASSERT_MSG("ENSURE: \"%s\" in file %s, line %d %s", cond, file, line, info);
Index: client-2.10.1/src/common/vfs.h
===================================================================
--- client-2.10.1.orig/src/common/vfs.h
+++ client-2.10.1/src/common/vfs.h
@@ -162,17 +162,17 @@ public:
     virtual bool isHydrating() const = 0;
 
     /// Create a new dehydrated placeholder. Called from PropagateDownload.
-    virtual OC_REQUIRED_RESULT Result<void, QString> createPlaceholder(const SyncFileItem &item) = 0;
+    OC_REQUIRED_RESULT virtual Result<void, QString> createPlaceholder(const SyncFileItem &item) = 0;
 
     /** Discovery hook: even unchanged files may need UPDATE_METADATA.
      *
      * For instance cfapi vfs wants local hydrated non-placeholder files to
      * become hydrated placeholder files.
      */
-    virtual OC_REQUIRED_RESULT bool needsMetadataUpdate(const SyncFileItem &item) = 0;
+    OC_REQUIRED_RESULT virtual bool needsMetadataUpdate(const SyncFileItem &item) = 0;
 
     /// Determine whether the file at the given absolute path is a dehydrated placeholder.
-    virtual OC_REQUIRED_RESULT bool isDehydratedPlaceholder(const QString &filePath) = 0;
+    OC_REQUIRED_RESULT virtual bool isDehydratedPlaceholder(const QString &filePath) = 0;
 
     /** Similar to isDehydratedPlaceholder() but used from sync discovery.
      *
@@ -181,7 +181,7 @@ public:
      *
      * Returning true means that type was fully determined.
      */
-    virtual OC_REQUIRED_RESULT bool statTypeVirtualFile(csync_file_stat_t *stat, void *stat_data) = 0;
+    OC_REQUIRED_RESULT virtual bool statTypeVirtualFile(csync_file_stat_t *stat, void *stat_data) = 0;
 
     /** Sets the pin state for the item at a path.
      *
@@ -192,7 +192,7 @@ public:
      *
      * relFilePath is relative to the sync folder. Can be "" for root folder.
      */
-    virtual OC_REQUIRED_RESULT bool setPinState(const QString &relFilePath, PinState state) = 0;
+    OC_REQUIRED_RESULT virtual bool setPinState(const QString &relFilePath, PinState state) = 0;
 
     /** Returns the pin state of an item at a path.
      *
@@ -203,7 +203,7 @@ public:
      *
      * Returns none on retrieval error.
      */
-    virtual OC_REQUIRED_RESULT Optional<PinState> pinState(const QString &relFilePath) = 0;
+    OC_REQUIRED_RESULT virtual Optional<PinState> pinState(const QString &relFilePath) = 0;
 
     /** Returns availability status of an item at a path.
      *
@@ -212,7 +212,7 @@ public:
      *
      * folderPath is relative to the sync folder. Can be "" for root folder.
      */
-    virtual OC_REQUIRED_RESULT AvailabilityResult availability(const QString &folderPath) = 0;
+    OC_REQUIRED_RESULT virtual AvailabilityResult availability(const QString &folderPath) = 0;
 
 public slots:
     /** Update in-sync state based on SyncFileStatusTracker signal.
@@ -240,7 +240,7 @@ protected:
      * If the remote metadata changes, the local placeholder's metadata should possibly
      * change as well.
      */
-    virtual OC_REQUIRED_RESULT Result<ConvertToPlaceholderResult, QString> updateMetadata(const SyncFileItem &item, const QString &filePath, const QString &replacesFile) = 0;
+    OC_REQUIRED_RESULT virtual Result<ConvertToPlaceholderResult, QString> updateMetadata(const SyncFileItem &item, const QString &filePath, const QString &replacesFile) = 0;
 
     /** Setup the plugin for the folder.
      *