/usr/include/OpenMS/COMPARISON/CLUSTERING/ is in libopenms-dev 1.11.1-5.
This file is owned by root:root, with mode 0o755.
..
/usr/include/OpenMS/COMPARISON/CLUSTERING/AverageLinkage.h
/usr/include/OpenMS/COMPARISON/CLUSTERING/ClusterAnalyzer.h
/usr/include/OpenMS/COMPARISON/CLUSTERING/ClusterFunctor.h
/usr/include/OpenMS/COMPARISON/CLUSTERING/ClusterHierarchical.h
/usr/include/OpenMS/COMPARISON/CLUSTERING/CompleteLinkage.h
/usr/include/OpenMS/COMPARISON/CLUSTERING/EuclideanSimilarity.h
/usr/include/OpenMS/COMPARISON/CLUSTERING/HashGrid.h
/usr/include/OpenMS/COMPARISON/CLUSTERING/HierarchicalClustering.h
/usr/include/OpenMS/COMPARISON/CLUSTERING/SILACClustering.h
/usr/include/OpenMS/COMPARISON/CLUSTERING/SingleLinkage.h
/usr/include/OpenMS/COMPARISON/CLUSTERING/sources.cmake