/usr/include/ql/indexes/ is in libquantlib0-dev 1.7.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/ql/indexes/all.hpp
/usr/include/ql/indexes/bmaindex.hpp
/usr/include/ql/indexes/ibor/
/usr/include/ql/indexes/ibor/all.hpp
/usr/include/ql/indexes/ibor/audlibor.hpp
/usr/include/ql/indexes/ibor/cadlibor.hpp
/usr/include/ql/indexes/ibor/cdor.hpp
/usr/include/ql/indexes/ibor/chflibor.hpp
/usr/include/ql/indexes/ibor/dkklibor.hpp
/usr/include/ql/indexes/ibor/eonia.hpp
/usr/include/ql/indexes/ibor/euribor.hpp
/usr/include/ql/indexes/ibor/eurlibor.hpp
/usr/include/ql/indexes/ibor/fedfunds.hpp
/usr/include/ql/indexes/ibor/gbplibor.hpp
/usr/include/ql/indexes/ibor/jibar.hpp
/usr/include/ql/indexes/ibor/jpylibor.hpp
/usr/include/ql/indexes/ibor/libor.hpp
/usr/include/ql/indexes/ibor/nzdlibor.hpp
/usr/include/ql/indexes/ibor/seklibor.hpp
/usr/include/ql/indexes/ibor/shibor.hpp
/usr/include/ql/indexes/ibor/sonia.hpp
/usr/include/ql/indexes/ibor/tibor.hpp
/usr/include/ql/indexes/ibor/trlibor.hpp
/usr/include/ql/indexes/ibor/usdlibor.hpp
/usr/include/ql/indexes/ibor/zibor.hpp
/usr/include/ql/indexes/iborindex.hpp
/usr/include/ql/indexes/indexmanager.hpp
/usr/include/ql/indexes/inflation/
/usr/include/ql/indexes/inflation/all.hpp
/usr/include/ql/indexes/inflation/aucpi.hpp
/usr/include/ql/indexes/inflation/euhicp.hpp
/usr/include/ql/indexes/inflation/frhicp.hpp
/usr/include/ql/indexes/inflation/ukrpi.hpp
/usr/include/ql/indexes/inflation/uscpi.hpp
/usr/include/ql/indexes/inflation/zacpi.hpp
/usr/include/ql/indexes/inflationindex.hpp
/usr/include/ql/indexes/interestrateindex.hpp
/usr/include/ql/indexes/region.hpp
/usr/include/ql/indexes/swap/
/usr/include/ql/indexes/swap/all.hpp
/usr/include/ql/indexes/swap/chfliborswap.hpp
/usr/include/ql/indexes/swap/euriborswap.hpp
/usr/include/ql/indexes/swap/eurliborswap.hpp
/usr/include/ql/indexes/swap/gbpliborswap.hpp
/usr/include/ql/indexes/swap/jpyliborswap.hpp
/usr/include/ql/indexes/swap/usdliborswap.hpp
/usr/include/ql/indexes/swapindex.hpp