option('tests', type : 'feature', description : 'Build tests')
option('nlmode', type : 'feature', description : 'no run-time control')
option('phal', type : 'feature', value : 'disabled',
        description : '''Enable PHAL APIs for retrieving data from the POWER
                         Systems device tree''')
option('attn_config', type : 'string', value : '',
        description : '''Attention handler default configuration override''')