/usr/include/CiftiLib/ is in libcifti-dev 1.5.1-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/CiftiLib/Cifti/
/usr/include/CiftiLib/Cifti/CiftiBrainModelsMap.h
/usr/include/CiftiLib/Cifti/CiftiLabelsMap.h
/usr/include/CiftiLib/Cifti/CiftiMappingType.h
/usr/include/CiftiLib/Cifti/CiftiParcelsMap.h
/usr/include/CiftiLib/Cifti/CiftiScalarsMap.h
/usr/include/CiftiLib/Cifti/CiftiSeriesMap.h
/usr/include/CiftiLib/Cifti/CiftiVersion.h
/usr/include/CiftiLib/Cifti/CiftiXML.h
/usr/include/CiftiLib/Cifti/Label.h
/usr/include/CiftiLib/Cifti/LabelTable.h
/usr/include/CiftiLib/Cifti/MetaData.h
/usr/include/CiftiLib/Cifti/StructureEnum.h
/usr/include/CiftiLib/Cifti/VolumeSpace.h
/usr/include/CiftiLib/CiftiFile.h
/usr/include/CiftiLib/Common/
/usr/include/CiftiLib/Common/AString.h
/usr/include/CiftiLib/Common/BinaryFile.h
/usr/include/CiftiLib/Common/ByteSwapping.h
/usr/include/CiftiLib/Common/CiftiAssert.h
/usr/include/CiftiLib/Common/CiftiException.h
/usr/include/CiftiLib/Common/CiftiMutex.h
/usr/include/CiftiLib/Common/Compact3DLookup.h
/usr/include/CiftiLib/Common/CompactLookup.h
/usr/include/CiftiLib/Common/FloatMatrix.h
/usr/include/CiftiLib/Common/MathFunctions.h
/usr/include/CiftiLib/Common/MatrixFunctions.h
/usr/include/CiftiLib/Common/MultiDimArray.h
/usr/include/CiftiLib/Common/MultiDimIterator.h
/usr/include/CiftiLib/Common/Vector3D.h
/usr/include/CiftiLib/Common/VoxelIJK.h
/usr/include/CiftiLib/Common/XmlAdapter.h
/usr/include/CiftiLib/Nifti/
/usr/include/CiftiLib/Nifti/NiftiHeader.h
/usr/include/CiftiLib/Nifti/nifti1.h
/usr/include/CiftiLib/Nifti/nifti2.h
/usr/include/CiftiLib/NiftiIO.h