/usr/include/ is in libxplc0.3.13-dev 0.3.13-3ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/xplc-0.3.13/
/usr/include/xplc-0.3.13/xplc/
/usr/include/xplc-0.3.13/xplc/IObject.h
/usr/include/xplc-0.3.13/xplc/ptr.h
/usr/include/xplc-0.3.13/xplc/utils.h
/usr/include/xplc-0.3.13/xplc/IServiceManager.h
/usr/include/xplc-0.3.13/xplc/module.h
/usr/include/xplc-0.3.13/xplc/xplc.h
/usr/include/xplc-0.3.13/xplc/IModule.h
/usr/include/xplc-0.3.13/xplc/ICategory.h
/usr/include/xplc-0.3.13/xplc/IWeakRef.h
/usr/include/xplc-0.3.13/xplc/IStaticServiceHandler.h
/usr/include/xplc-0.3.13/xplc/IServiceHandler.h
/usr/include/xplc-0.3.13/xplc/factory.h
/usr/include/xplc-0.3.13/xplc/IModuleManagerFactory.h
/usr/include/xplc-0.3.13/xplc/IMonikerService.h
/usr/include/xplc-0.3.13/xplc/delete.h
/usr/include/xplc-0.3.13/xplc/IMoniker.h
/usr/include/xplc-0.3.13/xplc/uuid.h
/usr/include/xplc-0.3.13/xplc/uuidops.h
/usr/include/xplc-0.3.13/xplc/ICategoryManager.h
/usr/include/xplc-0.3.13/xplc/ICategoryIterator.h
/usr/include/xplc-0.3.13/xplc/core.h
/usr/include/xplc-0.3.13/xplc/trace.h
/usr/include/xplc-0.3.13/xplc/IModuleLoader.h
/usr/include/xplc-0.3.13/xplc/IFactory.h