/usr/include/freefoam/finiteVolume/LimitFuncs.C is in libfreefoam-dev 0.1.0+dfsg-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 1991-2010 OpenCFD Ltd.
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
\*---------------------------------------------------------------------------*/
#include <finiteVolume/volFields.H>
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
namespace limitFuncs
{
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
template<class Type>
inline tmp<volScalarField> magSqr<Type>::operator()
(
    const GeometricField<Type, fvPatchField, volMesh>& phi
) const
{
    return Foam::magSqr(phi);
}
template<>
inline tmp<volScalarField> magSqr<scalar>::operator()
(
    const volScalarField& phi
) const
{
    return phi;
}
template<>
inline tmp<volScalarField> magSqr<tensor>::operator()
(
    const volTensorField& phi
) const
{
    return Foam::tr(phi);
}
template<class Type>
inline tmp<volScalarField> rhoMagSqr<Type>::operator()
(
    const GeometricField<Type, fvPatchField, volMesh>& phi
) const
{
    const volScalarField& rho =
        phi.db().objectRegistry::lookupObject<volScalarField>("rho");
    return Foam::magSqr(phi/rho);
}
template<>
inline tmp<volScalarField> rhoMagSqr<scalar>::operator()
(
    const volScalarField& phi
) const
{
    const volScalarField& rho =
        phi.db().objectRegistry::lookupObject<volScalarField>("rho");
    return phi/rho;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace limitFuncs
} // End namespace Foam
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