/usr/include/arc/message/ is in nordugrid-arc-dev 5.0.5-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/arc/message/MCC.h
/usr/include/arc/message/MCCLoader.h
/usr/include/arc/message/MCC_Status.h
/usr/include/arc/message/Message.h
/usr/include/arc/message/MessageAttributes.h
/usr/include/arc/message/MessageAuth.h
/usr/include/arc/message/PayloadRaw.h
/usr/include/arc/message/PayloadSOAP.h
/usr/include/arc/message/PayloadStream.h
/usr/include/arc/message/Plexer.h
/usr/include/arc/message/SOAPEnvelope.h
/usr/include/arc/message/SOAPMessage.h
/usr/include/arc/message/SecAttr.h
/usr/include/arc/message/SecHandler.h
/usr/include/arc/message/Service.h