/usr/include/sbml/packages/qual/validator/ is in libsbml5-dev 5.16.0+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/sbml/packages/qual/validator/QualConsistencyValidator.h
/usr/include/sbml/packages/qual/validator/QualIdentifierConsistencyValidator.h
/usr/include/sbml/packages/qual/validator/QualMathConsistencyValidator.h
/usr/include/sbml/packages/qual/validator/QualSBMLError.h
/usr/include/sbml/packages/qual/validator/QualSBMLErrorTable.h
/usr/include/sbml/packages/qual/validator/QualValidator.h
/usr/include/sbml/packages/qual/validator/constraints/
/usr/include/sbml/packages/qual/validator/constraints/QSAssignedOnce.h
/usr/include/sbml/packages/qual/validator/constraints/QualCSymbolMathCheck.h
/usr/include/sbml/packages/qual/validator/constraints/QualUniqueModelWideIds.h
/usr/include/sbml/packages/qual/validator/constraints/ResultBecomesNegative.h
/usr/include/sbml/packages/qual/validator/constraints/ResultExceedsMaximum.h