/usr/include/pbbam/internal/ is in libpbbam-dev 0.7.4+ds-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/pbbam/internal/Accuracy.inl
/usr/include/pbbam/internal/BamHeader.inl
/usr/include/pbbam/internal/BamRecord.inl
/usr/include/pbbam/internal/BamRecordBuilder.inl
/usr/include/pbbam/internal/BamRecordImpl.inl
/usr/include/pbbam/internal/BamRecordView.inl
/usr/include/pbbam/internal/Cigar.inl
/usr/include/pbbam/internal/CigarOperation.inl
/usr/include/pbbam/internal/Compare.inl
/usr/include/pbbam/internal/CompositeBamReader.inl
/usr/include/pbbam/internal/DataSet.inl
/usr/include/pbbam/internal/DataSetBaseTypes.h
/usr/include/pbbam/internal/DataSetBaseTypes.inl
/usr/include/pbbam/internal/DataSetElement.h
/usr/include/pbbam/internal/DataSetElement.inl
/usr/include/pbbam/internal/DataSetListElement.h
/usr/include/pbbam/internal/DataSetListElement.inl
/usr/include/pbbam/internal/DataSetTypes.inl
/usr/include/pbbam/internal/FastaSequence.inl
/usr/include/pbbam/internal/Frames.inl
/usr/include/pbbam/internal/GenomicInterval.inl
/usr/include/pbbam/internal/Interval.inl
/usr/include/pbbam/internal/PbiBasicTypes.inl
/usr/include/pbbam/internal/PbiFilter.inl
/usr/include/pbbam/internal/PbiFilterTypes.inl
/usr/include/pbbam/internal/PbiIndex.inl
/usr/include/pbbam/internal/PbiLookupData.inl
/usr/include/pbbam/internal/PbiRawData.inl
/usr/include/pbbam/internal/ProgramInfo.inl
/usr/include/pbbam/internal/QualityValue.inl
/usr/include/pbbam/internal/QualityValues.inl
/usr/include/pbbam/internal/QueryBase.h
/usr/include/pbbam/internal/QueryBase.inl
/usr/include/pbbam/internal/ReadGroupInfo.inl
/usr/include/pbbam/internal/SequenceInfo.inl
/usr/include/pbbam/internal/Tag.inl
/usr/include/pbbam/internal/Validator.inl