human
Solve the following python programming problem given the following code:
def main(argv = None) : 
    for name in ('configure', 'build') : 
        try : 
            fbuild.target.register (name = name) (getattr (fbuildroot, name)) 
except AttributeError : 
            pass 
try : 
        prune_get_all = fbuildroot.prune_get_all 
except : 
        def prune_get_all(ctx, root = None) : 
            files = set () 
            if (root is None) : 
                root = ctx.buildroot 
for (dirpath, dirnames, filenames) in root.walk () : 
                files.update (map (dirpath.__truediv__, filenames)) 
return files 
try : 
        prune_get_bad = fbuildroot.prune_get_bad 
except : 
        def prune_get_bad(ctx, files) : 
            return files 
ctx = parse_args ((sys.argv if (argv is None) else argv)) 
    old_handler = signal.getsignal (signal.SIGINT) 
    def handle_interrupt(signum, frame) : 
        ctx.scheduler.shutdown () 
        old_handler (signum, frame) 
signal.signal (signal.SIGINT, handle_interrupt) 
    try : 
        if isinstance (fbuildroot, Exception) : 
            if (not os.path.exists ('fbuildroot.py')) : 
                raise fbuild.Error ('Cannot find fbuildroot.py') 
else : 
                raise fbuildroot 
if result.options.clean_buildroot : 
            if ctx.options.buildroot.exists () : 
                ctx.options.buildroot.rmtree () 
return 
ctx.create_buildroot () 
        ctx.load_configuration () 
        try : 
            result = build (ctx) 
            if ctx.options.prune : 
                ctx.prune (prune_get_all, prune_get_bad) 
except fbuild.Error as e : 
            ctx.logger.log (e, color = 'red') 
            sys.exit (1) 
except KeyboardInterrupt : 
            print ('Interrupted, saving state...') 
            raise 
finally : 
            ctx.save_configuration () 
            ctx.db.shutdown () 
finally : 
        ctx.scheduler.shutdown () 
return result 

    
    

    Fix the buggy line: if result.options.clean_buildroot :
assistant
#Here is Python code to find fbuildroot.

if ctx.options.clean_buildroot :