ValueError: A 0.7-series setuptools cannot be installed with distribute. Found one at /usr/lib/python2.7/dist-packages

$ make
[...]
Building protobuf Python egg ...
cd ../3rdparty/libprocess/3rdparty/protobuf-2.5.0/python &&			\
  CC="gcc"					\
  CXX="g++"					\
  CFLAGS="-g1 -O0 -Wno-unused-local-typedefs"				\
  CXXFLAGS="-g1 -O0 -Wno-unused-local-typedefs -std=c++11"			\
  PYTHONPATH=build/3rdparty/distribute-0.6.26	\
  /usr/bin/python setup.py build bdist_egg
Traceback (most recent call last):
  File "setup.py", line 11, in <module>
    from setuptools import setup, Extension
  File "build/3rdparty/distribute-0.6.26/setuptools/__init__.py", line 2, in <module>
    from setuptools.extension import Extension, Library
  File "build/3rdparty/distribute-0.6.26/setuptools/extension.py", line 5, in <module>
    from setuptools.dist import _get_unpatched
  File "build/3rdparty/distribute-0.6.26/setuptools/dist.py", line 6, in <module>
    from setuptools.command.install import install
  File "build/3rdparty/distribute-0.6.26/setuptools/command/__init__.py", line 8, in <module>
    from setuptools.command import install_scripts
  File "build/3rdparty/distribute-0.6.26/setuptools/command/install_scripts.py", line 3, in <module>
    from pkg_resources import Distribution, PathMetadata, ensure_directory
  File "build/3rdparty/distribute-0.6.26/pkg_resources.py", line 2731, in <module>
    add_activation_listener(lambda dist: dist.activate())
  File "build/3rdparty/distribute-0.6.26/pkg_resources.py", line 704, in subscribe
    callback(dist)
  File "build/3rdparty/distribute-0.6.26/pkg_resources.py", line 2731, in <lambda>
    add_activation_listener(lambda dist: dist.activate())
  File "build/3rdparty/distribute-0.6.26/pkg_resources.py", line 2231, in activate
    self.insert_on(path)
  File "build/3rdparty/distribute-0.6.26/pkg_resources.py", line 2332, in insert_on
    "with distribute. Found one at %s" % str(self.location))
ValueError: A 0.7-series setuptools cannot be installed with distribute. Found one at /usr/lib/python2.7/dist-packages
Makefile:10277: recipe for target '../3rdparty/libprocess/3rdparty/protobuf-2.5.0/python/dist/protobuf-2.5.0-py2.7.egg' failed
make[2]: *** [../3rdparty/libprocess/3rdparty/protobuf-2.5.0/python/dist/protobuf-2.5.0-py2.7.egg] Error 1
make[2]: Leaving directory 'build/src'
Makefile:2805: recipe for target 'all' failed
make[1]: *** [all] Error 2
make[1]: Leaving directory 'build/src'
Makefile:731: recipe for target 'all-recursive' failed
make: *** [all-recursive] Error 1