/usr/include/opengm/functions/ is in libopengm-dev 2.3.6-2.
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/usr/include/opengm/functions/absolute_difference.hxx
/usr/include/opengm/functions/accumulated_view.hxx
/usr/include/opengm/functions/constant.hxx
/usr/include/opengm/functions/constraint_functions/
/usr/include/opengm/functions/constraint_functions/label_order_function.hxx
/usr/include/opengm/functions/constraint_functions/linear_constraint_function.hxx
/usr/include/opengm/functions/constraint_functions/linear_constraint_function_base.hxx
/usr/include/opengm/functions/constraint_functions/num_labels_limitation_function.hxx
/usr/include/opengm/functions/explicit_function.hxx
/usr/include/opengm/functions/fieldofexperts.hxx
/usr/include/opengm/functions/function_properties.hxx
/usr/include/opengm/functions/function_properties_base.hxx
/usr/include/opengm/functions/function_registration.hxx
/usr/include/opengm/functions/l_potts.hxx
/usr/include/opengm/functions/modelviewfunction.hxx
/usr/include/opengm/functions/operations/
/usr/include/opengm/functions/operations/accumulator.hxx
/usr/include/opengm/functions/operations/operator.hxx
/usr/include/opengm/functions/potts.hxx
/usr/include/opengm/functions/pottsg.hxx
/usr/include/opengm/functions/pottsn.hxx
/usr/include/opengm/functions/scaled_view.hxx
/usr/include/opengm/functions/singlesitefunction.hxx
/usr/include/opengm/functions/soft_constraint_functions/
/usr/include/opengm/functions/soft_constraint_functions/label_cost_function.hxx
/usr/include/opengm/functions/soft_constraint_functions/sum_constraint_function.hxx
/usr/include/opengm/functions/sparsemarray.hxx
/usr/include/opengm/functions/squared_difference.hxx
/usr/include/opengm/functions/truncated_absolute_difference.hxx
/usr/include/opengm/functions/truncated_squared_difference.hxx
/usr/include/opengm/functions/view.hxx
/usr/include/opengm/functions/view_convert_function.hxx
/usr/include/opengm/functions/view_fix_variables_function.hxx