env['drivers'].append('trace')
if 'rbug' not in env['drivers']:
env['drivers'].append('rbug')
env['drivers'].append('trace')
if 'rbug' not in env['drivers']:
env['drivers'].append('rbug')
if 'identity' not in env['drivers']:
env['drivers'].append('identity')
if 'softpipe' not in env['drivers']:
if 'identity' not in env['drivers']:
env['drivers'].append('identity')
if 'softpipe' not in env['drivers']: