/usr/include/quickfix/fix40/ is in libquickfix-dev 1.14.4+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/quickfix/fix40/Advertisement.h
/usr/include/quickfix/fix40/Allocation.h
/usr/include/quickfix/fix40/AllocationInstructionAck.h
/usr/include/quickfix/fix40/DontKnowTrade.h
/usr/include/quickfix/fix40/Email.h
/usr/include/quickfix/fix40/ExecutionReport.h
/usr/include/quickfix/fix40/Heartbeat.h
/usr/include/quickfix/fix40/IOI.h
/usr/include/quickfix/fix40/ListCancelRequest.h
/usr/include/quickfix/fix40/ListExecute.h
/usr/include/quickfix/fix40/ListStatus.h
/usr/include/quickfix/fix40/ListStatusRequest.h
/usr/include/quickfix/fix40/Logon.h
/usr/include/quickfix/fix40/Logout.h
/usr/include/quickfix/fix40/Message.h
/usr/include/quickfix/fix40/MessageCracker.h
/usr/include/quickfix/fix40/NewOrderList.h
/usr/include/quickfix/fix40/NewOrderSingle.h
/usr/include/quickfix/fix40/News.h
/usr/include/quickfix/fix40/OrderCancelReject.h
/usr/include/quickfix/fix40/OrderCancelReplaceRequest.h
/usr/include/quickfix/fix40/OrderCancelRequest.h
/usr/include/quickfix/fix40/OrderStatusRequest.h
/usr/include/quickfix/fix40/Quote.h
/usr/include/quickfix/fix40/QuoteRequest.h
/usr/include/quickfix/fix40/Reject.h
/usr/include/quickfix/fix40/ResendRequest.h
/usr/include/quickfix/fix40/SequenceReset.h
/usr/include/quickfix/fix40/TestRequest.h