/usr/include/freefoam/OpenFOAM/includeIfPresentEntry.H 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/>.
Class
    Foam::functionEntries::includeIfPresentEntry
Description
    Specify a file to include if it exists. Expects a single string to follow.
    The @c \#includeIfPresent directive is similar to the @c \#include
    directive, but does not generate an error if the file does not exist.
See Also
    Foam::functionEntries::includeEntry
SourceFiles
    includeIfPresentEntry.C
\*---------------------------------------------------------------------------*/
#ifndef includeIfPresentEntry_H
#define includeIfPresentEntry_H
#include <OpenFOAM/includeEntry.H>
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
namespace functionEntries
{
/*---------------------------------------------------------------------------*\
                    Class includeIfPresentEntry Declaration
\*---------------------------------------------------------------------------*/
class includeIfPresentEntry
:
    public includeEntry
{
    // Private Member Functions
        //- Disallow default bitwise copy construct
        includeIfPresentEntry(const includeIfPresentEntry&);
        //- Disallow default bitwise assignment
        void operator=(const includeIfPresentEntry&);
public:
    //- Runtime type information
    ClassName("includeIfPresent");
    // Member Functions
        //- Execute the functionEntry in a sub-dict context
        static bool execute(dictionary& parentDict, Istream&);
        //- Execute the functionEntry in a primitiveEntry context
        static bool execute
        (
            const dictionary& parentDict,
            primitiveEntry&,
            Istream&
        );
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace functionEntries
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************ vim: set sw=4 sts=4 et: ************************ //
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