/usr/include/quickfix/fix41/ is in libquickfix-dev 1.14.4+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/quickfix/fix41/Advertisement.h
/usr/include/quickfix/fix41/Allocation.h
/usr/include/quickfix/fix41/AllocationInstructionAck.h
/usr/include/quickfix/fix41/DontKnowTrade.h
/usr/include/quickfix/fix41/Email.h
/usr/include/quickfix/fix41/ExecutionReport.h
/usr/include/quickfix/fix41/Heartbeat.h
/usr/include/quickfix/fix41/IOI.h
/usr/include/quickfix/fix41/ListCancelRequest.h
/usr/include/quickfix/fix41/ListExecute.h
/usr/include/quickfix/fix41/ListStatus.h
/usr/include/quickfix/fix41/ListStatusRequest.h
/usr/include/quickfix/fix41/Logon.h
/usr/include/quickfix/fix41/Logout.h
/usr/include/quickfix/fix41/Message.h
/usr/include/quickfix/fix41/MessageCracker.h
/usr/include/quickfix/fix41/NewOrderList.h
/usr/include/quickfix/fix41/NewOrderSingle.h
/usr/include/quickfix/fix41/News.h
/usr/include/quickfix/fix41/OrderCancelReject.h
/usr/include/quickfix/fix41/OrderCancelReplaceRequest.h
/usr/include/quickfix/fix41/OrderCancelRequest.h
/usr/include/quickfix/fix41/OrderStatusRequest.h
/usr/include/quickfix/fix41/Quote.h
/usr/include/quickfix/fix41/QuoteRequest.h
/usr/include/quickfix/fix41/Reject.h
/usr/include/quickfix/fix41/ResendRequest.h
/usr/include/quickfix/fix41/SequenceReset.h
/usr/include/quickfix/fix41/SettlementInstructions.h
/usr/include/quickfix/fix41/TestRequest.h