/usr/include/sbml/packages/qual/ is in libsbml5-dev 5.10.0+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/sbml/packages/qual/common/
/usr/include/sbml/packages/qual/common/QualExtensionTypes.h
/usr/include/sbml/packages/qual/common/qualfwd.h
/usr/include/sbml/packages/qual/extension/
/usr/include/sbml/packages/qual/extension/QualExtension.h
/usr/include/sbml/packages/qual/extension/QualModelPlugin.h
/usr/include/sbml/packages/qual/extension/QualSBMLDocumentPlugin.h
/usr/include/sbml/packages/qual/sbml/
/usr/include/sbml/packages/qual/sbml/DefaultTerm.h
/usr/include/sbml/packages/qual/sbml/FunctionTerm.h
/usr/include/sbml/packages/qual/sbml/Input.h
/usr/include/sbml/packages/qual/sbml/Output.h
/usr/include/sbml/packages/qual/sbml/QualitativeSpecies.h
/usr/include/sbml/packages/qual/sbml/Transition.h
/usr/include/sbml/packages/qual/validator/
/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