def METHOD_NAME(env):
    """Add Builders and construction variables for rpm to an Environment."""
    try:
        bld = env['BUILDERS']['Rpm']
    except KeyError:
        bld = RpmBuilder
        env['BUILDERS']['Rpm'] = bld
    env.SetDefault(RPM          = 'LC_ALL=C rpmbuild')
    env.SetDefault(RPMFLAGS     = SCons.Util.CLVar('-ta'))
    env.SetDefault(RPMCOM       = rpmAction)
    env.SetDefault(RPMSUFFIX    = '.rpm')