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/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-real-debug/include/petsc/finclude/ftn-auto/petscpf.h90 is in libpetsc3.7.7-dbg 3.7.7+dfsg1-2build5.

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      subroutine PFApplyVec(a,b,c,z)
       PF a ! PF
       Vec b ! Vec
       Vec c ! Vec
       integer z
       end subroutine
      subroutine PFApply(a,b,c,d,z)
       PF a ! PF
       PetscInt b ! PetscInt
       PetscScalar c ! PetscScalar
       PetscScalar d ! PetscScalar
       integer z
       end subroutine
      subroutine PFView(a,b,z)
       PF a ! PF
       PetscViewer b ! PetscViewer
       integer z
       end subroutine
      subroutine PFSetFromOptions(a,z)
       PF a ! PF
       integer z
       end subroutine