This file is indexed.

/usr/lib/petscdir/3.1/include/finclude/ftn-custom/petscviewerhide.h90 is in libpetsc3.1-dev 3.1.dfsg-11ubuntu1.

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#if defined(PETSC_USE_FORTRAN_DATATYPES) && !defined(PETSCVIEWER_HIDE)
#define USE_PETSC_HIDE use petscsysdef
#define PETSCVIEWER_HIDE type(PetscViewer)
#elif !defined(USE_PETSC_HIDE)
#define USE_PETSC_HIDE
#define PETSCVIEWER_HIDE PetscViewer
#endif