def __cpu_arch(self):
        """Based on the CPU architecture, set values accordingly.  A user
        specified value overrides any defaults."""

        if hpccm.config.g_cpu_arch == cpu_arch.X86_64:
            if not self.__download_args:
                self.__download_args = '-x \*i?86 --archlist=x86_64'
Based on the CPU architecture, set values accordingly.  A user
        specified value overrides any defaults.
hpccm/building_blocks/yum.py