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/usr/lib/petscdir/3.7.5/x86_64-linux-gnu-complex/include/petsc/finclude/ftn-auto/petscdmpatch.h90 is in libpetsc-complex-3.7.5-dev 3.7.5+dfsg1-4+b1.

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      subroutine DMPatchCreate(a,b,z)
       integer a ! MPI_Comm
       DM b ! DM
       integer z
       end subroutine