/usr/include/libGIFTAcDistanceMatrix/ is in libgnuift0-dev 0.1.14+ds-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libGIFTAcDistanceMatrix/include/
/usr/include/libGIFTAcDistanceMatrix/include/CAFDistanceMatrix.h
/usr/include/libGIFTAcDistanceMatrix/include/CAFDistanceMatrix.h.kdoc
/usr/include/libGIFTAcDistanceMatrix/include/CAcDistanceMatrix.h
/usr/include/libGIFTAcDistanceMatrix/include/CDistanceCalculator.h
/usr/include/libGIFTAcDistanceMatrix/include/CDrawer.h
/usr/include/libGIFTAcDistanceMatrix/include/CIDToMatrixIndex.h
/usr/include/libGIFTAcDistanceMatrix/include/CInformationCalculator.h
/usr/include/libGIFTAcDistanceMatrix/include/CPersistentMatrix.h
/usr/include/libGIFTAcDistanceMatrix/include/CPersistentTranslatedIndexMatrix.h
/usr/include/libGIFTAcDistanceMatrix/include/CPersistentVector.h
/usr/include/libGIFTAcDistanceMatrix/include/CProbabilityCombiner.h
/usr/include/libGIFTAcDistanceMatrix/include/CSquasher.h
/usr/include/libGIFTAcDistanceMatrix/include/uses-declarations.h