/usr/include/freefoam/chemistryModel/ is in libfreefoam-dev 0.1.0+dfsg+1-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/freefoam/chemistryModel/EulerImplicit.C
/usr/include/freefoam/chemistryModel/EulerImplicit.H
/usr/include/freefoam/chemistryModel/ODEChemistryModel.C
/usr/include/freefoam/chemistryModel/ODEChemistryModel.H
/usr/include/freefoam/chemistryModel/ODEChemistryModelI.H
/usr/include/freefoam/chemistryModel/basicChemistryModel.H
/usr/include/freefoam/chemistryModel/basicChemistryModelI.H
/usr/include/freefoam/chemistryModel/chemistrySolver.C
/usr/include/freefoam/chemistryModel/chemistrySolver.H
/usr/include/freefoam/chemistryModel/makeChemistryModel.H
/usr/include/freefoam/chemistryModel/newChemistrySolver.C
/usr/include/freefoam/chemistryModel/ode.C
/usr/include/freefoam/chemistryModel/ode.H
/usr/include/freefoam/chemistryModel/psiChemistryModel.H
/usr/include/freefoam/chemistryModel/psiChemistryModelI.H
/usr/include/freefoam/chemistryModel/rhoChemistryModel.H
/usr/include/freefoam/chemistryModel/rhoChemistryModelI.H
/usr/include/freefoam/chemistryModel/sequential.C
/usr/include/freefoam/chemistryModel/sequential.H