/usr/include/libindi/ is in libindi-dev 1.2.0-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libindi/alignment/
/usr/include/libindi/alignment/AlignmentSubsystemForDrivers.h
/usr/include/libindi/alignment/AlignmentSubsystemForMathPlugins.h
/usr/include/libindi/alignment/BasicMathPlugin.h
/usr/include/libindi/alignment/BuiltInMathPlugin.h
/usr/include/libindi/alignment/ClientAPIForAlignmentDatabase.h
/usr/include/libindi/alignment/ClientAPIForMathPluginManagement.h
/usr/include/libindi/alignment/Common.h
/usr/include/libindi/alignment/ConvexHull.h
/usr/include/libindi/alignment/DriverCommon.h
/usr/include/libindi/alignment/InMemoryDatabase.h
/usr/include/libindi/alignment/MapPropertiesToInMemoryDatabase.h
/usr/include/libindi/alignment/MathPlugin.h
/usr/include/libindi/alignment/MathPluginManagement.h
/usr/include/libindi/alignment/SVDMathPlugin.h
/usr/include/libindi/alignment/TelescopeDirectionVectorSupportFunctions.h
/usr/include/libindi/base64.h
/usr/include/libindi/baseclient.h
/usr/include/libindi/basedevice.h
/usr/include/libindi/ccvt.h
/usr/include/libindi/ccvt_types.h
/usr/include/libindi/defaultdevice.h
/usr/include/libindi/eventloop.h
/usr/include/libindi/hidapi.h
/usr/include/libindi/indiapi.h
/usr/include/libindi/indibase.h
/usr/include/libindi/indibasetypes.h
/usr/include/libindi/indiccd.h
/usr/include/libindi/indicom.h
/usr/include/libindi/indicontroller.h
/usr/include/libindi/indidevapi.h
/usr/include/libindi/indidome.h
/usr/include/libindi/indidriver.h
/usr/include/libindi/indidustcapinterface.h
/usr/include/libindi/indifilterinterface.h
/usr/include/libindi/indifilterwheel.h
/usr/include/libindi/indifocuser.h
/usr/include/libindi/indifocuserinterface.h
/usr/include/libindi/indigps.h
/usr/include/libindi/indiguiderinterface.h
/usr/include/libindi/indilightboxinterface.h
/usr/include/libindi/indilogger.h
/usr/include/libindi/indiproperty.h
/usr/include/libindi/inditelescope.h
/usr/include/libindi/indiusbdevice.h
/usr/include/libindi/indiweather.h
/usr/include/libindi/jpegutils.h
/usr/include/libindi/lilxml.h
/usr/include/libindi/ser_recorder.h
/usr/include/libindi/stream_recorder.h
/usr/include/libindi/v4l2_builtin_decoder.h
/usr/include/libindi/v4l2_colorspace.h
/usr/include/libindi/v4l2_decode.h
/usr/include/libindi/v4l2_record.h