How could I fix the error for the installing of py27-pyobjc

[心如烛光]

Hi,all!
     I get an error while it is installing py27-pyobjc with macport.It returns:command execution failed.What may cause the problem?And how could I fix it?Thank's very much!!
 (My Xcode version is 5.1.1;the clang version is apple LLVM 5.1;)
 And here is part of the log file for port py27-pyobjc:
  _opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_python_py-pyobjc/py27-pyobjc/work/destroot 
 :info:destroot Exit code: 1
 :error:destroot org.macports.destroot for port py27-pyobjc returned: command execution failed
 :debug:destroot Error code: CHILDSTATUS 6925 1
 :debug:destroot Backtrace: command execution failed
     while executing
 "system -nice 0 $fullcmdstring"
     ("eval" body line 1)
     invoked from within
 "eval system $notty $nice \$fullcmdstring"
     invoked from within
 "command_exec destroot"
     (procedure "portdestroot::destroot_main" line 2)
     invoked from within
 "portdestroot::destroot_main org.macports.destroot"
     ("eval" body line 1)
     invoked from within
 "eval $procedure $targetname"
 :info:destroot Warning: targets not executed for py27-pyobjc: org.macports.activate org.macports.destroot org.macports.install
 :notice:destroot Please see the log file for port py27-pyobjc for details:
     /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_python_py-pyobjc/py27-pyobjc/main.log
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.macosforge.org/pipermail/macports-users/attachments/20140619/98008f3f/attachment.html>