The particular calls that fails to be linked is the following in step-18.cc,
system_matrix.reinit (mpi_communicator,
sparsity_pattern,
local_dofs_per_process,
local_dofs_per_process,
this_mpi_process);
and
TopLevel<dim>::TopLevel ()
:
fe (FE_Q<dim>(1), dim),
dof_handler (triangulation),
quadrature_formula (2),
mpi_communicator (MPI_COMM_WORLD),
n_mpi_processes
(Utilities::System::get_n_mpi_processes(mpi_communicator)),
this_mpi_process
(Utilities::System::get_this_mpi_process(mpi_communicator)),
pcout (std::cout, this_mpi_process == 0)
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