Make it compile cleanly

Source/NSFileVersion.m

@@ -1,4 +1,80 @@
 #include <Foundation/NSFileVersion.h>
 
 @implementation NSFileVersion
+
+- (BOOL) isDiscardable
+{
+  return _isDiscardable;
+}
+- (void) setDiscardable: (BOOL)flag
+{
+  _isDiscardable = flag;
+}
+
+- (BOOL) isResolved
+{
+  return _isResolved;
+}
+
+- (void) setResolved: (BOOL)flag
+{
+  _isResolved = flag;
+}
+
+- (NSDate *) modificationDate
+{
+  return _modificationDate;
+}
+
+- (NSPersonNameComponents *) originatorNameComponents
+{
+  return nil;
+}
+
+- (NSString *) localizedName
+{
+  return _localizedName;
+}
+
+- (NSString *) localizedNameOfSavingComputer
+{
+  return _localizedNameOfSavingComputer;
+}
+
+- (BOOL) hasLocalContents
+{
+  return _hasLocalContents;
+}
+
+- (BOOL) hasThumbnail
+{
+  return _hasThumbnail;
+}
+
+- (NSURL *) URL
+{
+  return _fileURL;
+}
+
+- (BOOL) conflict
+{
+  return _conflict;
+}
+
+- (id<NSCoding>) persistentIdentifier
+{
+  return nil;
+}
+
+- (BOOL) removeAndReturnError: (NSError **)outError
+{
+  outError = NULL;
+  return NO;
+}
+
+- (NSURL *) replaceItemAtURL: (NSURL *)url options:(NSFileVersionReplacingOptions)options error:(NSError **)error
+{
+  return nil;
+}
+
 @end