code: def _export_csrc_gnumake(self, dirname, name, prefix):
      param = ""
      if len(self._info._parameters) > 0:
          param = " {}_parameters.c".format(name)
      gnumake = csrc_gnumake.format(name=name, param=param)
  
      gnumake_filename = os.path.join(
          dirname, "GNUmakefile".format(name)
      )
      with open(gnumake_filename, "w") as f:
          f.write(gnumake)
  
file_path: nnabla/python/src/nnabla/utils/converter/nnablart/csrc.py
imports: import os
  import nnabla.utils.converter
  from .csrc_templates import csrc_parameters_defines, csrc_parameters_implements, csrc_defines, csrc_implements, csrc_example, csrc_gnumake
  from .utils import create_nnabart_info
  from .utils import preprocess_for_exporter
label_desc: Use image node_id 6 for calling the CsrcExporter obj's underlying member method code with example usage: obj._export_csrc_gnumake(dirname, name, prefix) without return types