Error building python3.4

[andy47@…]

When trying to install the latest python34 port today I get the following error message;

--->  Applying patches to python34
--->  Configuring python34
--->  Building python34
Error: org.macports.build for port python34 returned: command execution failed
Please see the log file for port python34 for details:
    /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_python34/python34/main.log
To report a bug, follow the instructions in the guide:
    http://guide.macports.org/#project.tickets
Error: Processing of port python34 failed

The referenced log file includes these lines;

:info:build   File "<frozen importlib._bootstrap>", line 1554, in get_code
:info:build   File "<frozen importlib._bootstrap>", line 672, in _code_to_bytecode
:info:build ValueError: unmarshallable object
:info:build make: *** [pybuilddir.txt] Segmentation fault: 11
:info:build make: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_python34/python34/work/Python-3.4.0'
:info:build Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_python34/python34/work/Python-3.4.0" && /usr/bin/make -j4 -w all MAKE="/usr/bin/make CC=/usr/bin/llvm-gcc-4.2" 
:info:build Exit code: 2
:error:build org.macports.build for port python34 returned: command execution failed
:debug:build Error code: CHILDSTATUS 63879 2
:debug:build Backtrace: command execution failed
    while executing
"system -nice 0 $fullcmdstring"
    ("eval" body line 1)
    invoked from within
"eval system $notty $nice \$fullcmdstring"
    invoked from within
"command_exec build"
    (procedure "portbuild::build_main" line 8)
    invoked from within
"$procedure $targetname"

I have attached the full log file to the ticket if that helps.

I already have the python33 port installed but got the same errors messages after I had uninstalled it so I don't think that the problem is across Python versions