Configure error during port upgrade

[Rob Belics]

I've had this problem since trying to upgrade to version 35, I think, and
except for showing this a month ago, haven't had a chance to look into it.
Here is the output trying to upgrade Firefox using portmaster. I also tried
uninstalling Firefox and reinstalling to no avail:

Installing setuptools, pip...
  Complete output from command /usr/ports/www/firef...ualenv/bin/python2.7
-c "import sys, pip; sys...d\"] + sys.argv[1:]))" setuptools pip:
  Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File
"/usr/ports/www/firefox/work/mozilla-release/python/virtualenv/virtualenv_support/pip-1.5.4-py2.py3-none-any.whl/pip/__init__.py",
line 10, in <module>
  File
"/usr/ports/www/firefox/work/mozilla-release/python/virtualenv/virtualenv_support/pip-1.5.4-py2.py3-none-any.whl/pip/util.py",
line 18, in <module>
  File
"/usr/ports/www/firefox/work/mozilla-release/python/virtualenv/virtualenv_support/pip-1.5.4-py2.py3-none-any.whl/pip/_vendor/distlib/version.py",
line 14, in <module>
  File
"/usr/ports/www/firefox/work/mozilla-release/python/virtualenv/virtualenv_support/pip-1.5.4-py2.py3-none-any.whl/pip/_vendor/distlib/compat.py",
line 31, in <module>
ImportError: cannot import name HTTPSHandler
----------------------------------------
...Installing setuptools, pip...done.
Traceback (most recent call last):
  File
"/usr/ports/www/firefox/work/mozilla-release/python/virtualenv/virtualenv.py",
line 2338, in <module>
    main()
  File
"/usr/ports/www/firefox/work/mozilla-release/python/virtualenv/virtualenv.py",
line 824, in main
    symlink=options.symlink)
  File
"/usr/ports/www/firefox/work/mozilla-release/python/virtualenv/virtualenv.py",
line 992, in create_environment
    install_wheel(to_install, py_executable, search_dirs)
  File
"/usr/ports/www/firefox/work/mozilla-release/python/virtualenv/virtualenv.py",
line 960, in install_wheel
    'PIP_NO_INDEX': '1'
  File
"/usr/ports/www/firefox/work/mozilla-release/python/virtualenv/virtualenv.py",
line 902, in call_subprocess
    % (cmd_desc, proc.returncode))
OSError: Command /usr/ports/www/firef...ualenv/bin/python2.7 -c "import
sys, pip; sys...d\"] + sys.argv[1:]))" setuptools pip failed with error
code 1
Traceback (most recent call last):
  File
"/usr/ports/www/firefox/work/mozilla-release/python/mozbuild/mozbuild/virtualenv.py",
line 473, in <module>
    manager.ensure()
  File
"/usr/ports/www/firefox/work/mozilla-release/python/mozbuild/mozbuild/virtualenv.py",
line 128, in ensure
    return self.build()
  File
"/usr/ports/www/firefox/work/mozilla-release/python/mozbuild/mozbuild/virtualenv.py",
line 371, in build
    self.create()
  File
"/usr/ports/www/firefox/work/mozilla-release/python/mozbuild/mozbuild/virtualenv.py",
line 147, in create
    raise Exception('Error creating virtualenv.')
Exception: Error creating virtualenv.
------ config.log ------
This file contains any messages produced by compilers while
running configure, to aid debugging if configure makes a mistake.

configure:1220: checking host system type
configure:1241: checking target system type
configure:1259: checking build system type
configure:1335: checking for mawk
configure:1335: checking for gawk
configure:1335: checking for nawk
*** Fix above errors and then restart with\
               "gmake -f client.mk build"
/usr/ports/www/firefox/work/mozilla-release/client.mk:361: recipe for
target 'configure' failed
gmake: *** [configure] Error 1
===>  Script "configure" failed unexpectedly.
Please report the problem to gecko at FreeBSD.org [maintainer] and attach the
"/usr/ports/www/firefox/work/mozilla-release/config.log" including the
output
of the failure of your make command. Also, it might be a good idea to
provide
an overview of all packages installed on your system (e.g. a
/usr/local/sbin/pkg-static info -g -Ea).
*** [gecko-do-configure] Error code 1

Stop in /usr/ports/www/firefox.
*** [build] Error code 1

Stop in /usr/ports/www/firefox.

===>>> make build failed for www/firefox
===>>> Aborting update