/usr/include/osl/search/ is in libosl-dev 0.6.0-3.3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/osl/search/alphaBeta2.h
/usr/include/osl/search/alphaBeta2Parallel.h
/usr/include/osl/search/alphaBeta3.h
/usr/include/osl/search/alphaBeta4.h
/usr/include/osl/search/analyzer/
/usr/include/osl/search/analyzer/categoryMoveVector.h
/usr/include/osl/search/analyzer/dotWriter.h
/usr/include/osl/search/analyzer/logWriter.h
/usr/include/osl/search/analyzer/readme.h
/usr/include/osl/search/analyzer/recordSet_.h
/usr/include/osl/search/bigramKillerMove.h
/usr/include/osl/search/breakThreatmate.h
/usr/include/osl/search/dominanceCheck.h
/usr/include/osl/search/dualThreatmateState.h
/usr/include/osl/search/firstMoveThreatmate.h
/usr/include/osl/search/fixedEval.h
/usr/include/osl/search/hashRejections.h
/usr/include/osl/search/historyTable.h
/usr/include/osl/search/killerMoveTable.h
/usr/include/osl/search/lRUMoves.h
/usr/include/osl/search/moveGenerator.h
/usr/include/osl/search/moveScore.h
/usr/include/osl/search/moveStackRejections.h
/usr/include/osl/search/moveWithComment.h
/usr/include/osl/search/passCounter.h
/usr/include/osl/search/quiescenceGenerator.h
/usr/include/osl/search/quiescenceGenerator.tcc
/usr/include/osl/search/quiescenceLog.h
/usr/include/osl/search/quiescenceRecord.h
/usr/include/osl/search/quiescenceSearch2.h
/usr/include/osl/search/quiescenceSearch2.tcc
/usr/include/osl/search/readme.h
/usr/include/osl/search/realizationProbability.h
/usr/include/osl/search/sacrificeCheck.h
/usr/include/osl/search/searchBase.h
/usr/include/osl/search/searchMonitor.h
/usr/include/osl/search/searchRecorder.h
/usr/include/osl/search/searchState2.h
/usr/include/osl/search/searchTable.h
/usr/include/osl/search/searchTimer.h
/usr/include/osl/search/searchWindow.h
/usr/include/osl/search/shouldPromoteCut.h
/usr/include/osl/search/simpleHashRecord.h
/usr/include/osl/search/simpleHashTable.h
/usr/include/osl/search/sortCaptureMoves.h
/usr/include/osl/search/threatmateState.h
/usr/include/osl/search/timeControl.h
/usr/include/osl/search/usiReporter.h