build failure firefox43 on FreeBSD 10.2-RELEASE-p8

[Christoph Moench-Tegeder]

## blackcat (burkhard.kleemeier at t-online.de):

> Traceback (most recent call last):
>   File "./config.status", line 1043, in <module>
>     config_status(**args)
>   File "/usr/ports/www/firefox/work/firefox-43.0.1/python/mozbuild/mozbuild/config_status.py", line 149, in config_status
>     summary = the_backend.consume(definitions)
>   File "/usr/ports/www/firefox/work/firefox-43.0.1/python/mozbuild/mozbuild/backend/base.py", line 180, in consume
>     for obj in objs:
>   File "/usr/ports/www/firefox/work/firefox-43.0.1/python/mozbuild/mozbuild/frontend/emitter.py", line 151, in emit
>     for out in output:
>   File "/usr/ports/www/firefox/work/firefox-43.0.1/python/mozbuild/mozbuild/frontend/reader.py", line 1041, in read_mozbuild
>     raise bre
> mozbuild.frontend.reader.BuildReaderError: 

Not reproducable with a "clean" build. Any options?

Regards,
Christoph

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