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/usr/include/freefoam/OpenFOAM/setRootCase.H is in libfreefoam-dev 0.1.0+dfsg-1build1.

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//
// setRootCase.H
// ~~~~~~~~~~~~~

    Foam::argList args(argc, argv);
    if (!args.checkRootCase())
    {
        Foam::FatalError.exit();
    }