The file Modules/MitkExt/DataManagement/mitkItkBaseDataAdapter.h is missing include guards.

Something like this should work (btw include guards in that directory are not quite consistent):

diff --git a/Modules/MitkExt/DataManagement/mitkItkBaseDataAdapter.h b/Modules/MitkExt/DataManagement/mitkItkBaseDataAdapter.h
index b63dad0..7eb5451 100644

• a/Modules/MitkExt/DataManagement/mitkItkBaseDataAdapter.h

+++ b/Modules/MitkExt/DataManagement/mitkItkBaseDataAdapter.h
@@ -14,6 +14,9 @@ See LICENSE.txt or http://www.mitk.org for details.

===================================================================*/

+#ifndef mitkItkBaseDataAdapter_h
+#define mitkItkBaseDataAdapter_h
+
#include "mitkBaseData.h"
#include "MitkExtExports.h"

@@ -54,3 +57,5 @@ protected:
};

}
+
+#endif