/usr/include/libpwiz/pwiz/analysis/peakdetect/ is in libpwiz-dev 3.0.4624-6ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libpwiz/pwiz/analysis/peakdetect/FeatureDetector.hpp
/usr/include/libpwiz/pwiz/analysis/peakdetect/FeatureDetectorPeakel.hpp
/usr/include/libpwiz/pwiz/analysis/peakdetect/FeatureDetectorSimple.hpp
/usr/include/libpwiz/pwiz/analysis/peakdetect/FeatureModeler.hpp
/usr/include/libpwiz/pwiz/analysis/peakdetect/MZRTField.hpp
/usr/include/libpwiz/pwiz/analysis/peakdetect/Noise.hpp
/usr/include/libpwiz/pwiz/analysis/peakdetect/PeakExtractor.hpp
/usr/include/libpwiz/pwiz/analysis/peakdetect/PeakFamilyDetector.hpp
/usr/include/libpwiz/pwiz/analysis/peakdetect/PeakFamilyDetectorFT.hpp
/usr/include/libpwiz/pwiz/analysis/peakdetect/PeakFinder.hpp
/usr/include/libpwiz/pwiz/analysis/peakdetect/PeakFitter.hpp
/usr/include/libpwiz/pwiz/analysis/peakdetect/PeakelGrower.hpp
/usr/include/libpwiz/pwiz/analysis/peakdetect/PeakelPicker.hpp