ns3.18.1 configuration sous ubuntu

je voulais configurer le NS3.18.1 ( projet iTetris) mais depuis hier je galère, en tapant ce code

Code:

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a)./waf -d optimized --enable-examples --enable-tests --disable-python configure

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il me sort ce message

Citation:

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Traceback (most recent call last):
File "/home/training/NS3-SIM/ns-3.18.1/.waf-1.7.11-edc6ccb516c5e3f9b892efc9f53a610f/waflib/Scripting.py", line 97, in waf_entry_point
run_commands()
File "/home/training/NS3-SIM/ns-3.18.1/.waf-1.7.11-edc6ccb516c5e3f9b892efc9f53a610f/waflib/Scripting.py", line 153, in run_commands
ctx=run_command(cmd_name)
File "/home/training/NS3-SIM/ns-3.18.1/.waf-1.7.11-edc6ccb516c5e3f9b892efc9f53a610f/waflib/Scripting.py", line 146, in run_command
ctx.execute()
File "/home/training/NS3-SIM/ns-3.18.1/.waf-1.7.11-edc6ccb516c5e3f9b892efc9f53a610f/waflib/Configure.py", line 108, in execute
self.logger=Logs.make_logger(path,'cfg')
File "/home/training/NS3-SIM/ns-3.18.1/.waf-1.7.11-edc6ccb516c5e3f9b892efc9f53a610f/waflib/Logs.py", line 159, in make_logger
hdlr=logging.FileHandler(path,'w')
File "/usr/lib/python2.7/logging/__init__.py", line 897, in __init__
StreamHandler.__init__(self, self._open())
File "/usr/lib/python2.7/logging/__init__.py", line 916, in _open
stream = open(self.baseFilename, self.mode)
IOError: [Errno 13] Permission denied: '/home/training/NS3-SIM/ns-3.18.1/build/config.log'

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Merci pour votre aide