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diff --git a/doc/build.py b/doc/build.py
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index e5bcbf3b..73426713 100755
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--- a/doc/build.py
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+++ b/doc/build.py
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@@ -4,27 +4,9 @@
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 from __future__ import print_function
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 import errno, os, shutil, sys, tempfile
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 from subprocess import check_call, check_output, CalledProcessError, Popen, PIPE
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-from distutils.version import LooseVersion
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 versions = ['1.0.0', '1.1.0', '2.0.0', '3.0.2', '4.0.0', '4.1.0', '5.0.0', '5.1.0', '5.2.0', '5.2.1', '5.3.0', '6.0.0', '6.1.0', '6.1.1', '6.1.2', '6.2.0', '6.2.1']
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-def pip_install(package, commit=None, **kwargs):
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-  "Install package using pip."
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-  min_version = kwargs.get('min_version')
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-  if min_version:
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-    from pkg_resources import get_distribution, DistributionNotFound
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-    try:
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-      installed_version = get_distribution(os.path.basename(package)).version
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-      if LooseVersion(installed_version) >= min_version:
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-        print('{} {} already installed'.format(package, min_version))
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-        return
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-    except DistributionNotFound:
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-      pass
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-  if commit:
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-    package = 'git+https://github.com/{0}.git@{1}'.format(package, commit)
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-  print('Installing {0}'.format(package))
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-  check_call(['pip', 'install', package])
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-
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 def create_build_env(dirname='virtualenv'):
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   # Create virtualenv.
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   if not os.path.exists(dirname):
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@@ -34,30 +16,6 @@ def create_build_env(dirname='virtualenv'):
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   activate_this_file = os.path.join(dirname, scripts_dir, 'activate_this.py')
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   with open(activate_this_file) as f:
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     exec(f.read(), dict(__file__=activate_this_file))
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-  # Import get_distribution after activating virtualenv to get info about
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-  # the correct packages.
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-  from pkg_resources import get_distribution, DistributionNotFound
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-  # Upgrade pip because installation of sphinx with pip 1.1 available on Travis
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-  # is broken (see #207) and it doesn't support the show command.
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-  pip_version = get_distribution('pip').version
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-  if LooseVersion(pip_version) < LooseVersion('1.5.4'):
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-    print("Updating pip")
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-    check_call(['pip', 'install', '--upgrade', 'pip'])
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-  # Upgrade distribute because installation of sphinx with distribute 0.6.24
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-  # available on Travis is broken (see #207).
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-  try:
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-    distribute_version = get_distribution('distribute').version
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-    if LooseVersion(distribute_version) <= LooseVersion('0.6.24'):
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-      print("Updating distribute")
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-      check_call(['pip', 'install', '--upgrade', 'distribute'])
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-  except DistributionNotFound:
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-    pass
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-  # Install Sphinx and Breathe.
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-  pip_install('sphinx-doc/sphinx', '12b83372ac9316e8cbe86e7fed889296a4cc29ee',
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-              min_version='1.4.1.dev20160531')
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-  pip_install('michaeljones/breathe',
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-              '129222318f7c8f865d2631e7da7b033567e7f56a',
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-              min_version='4.2.0')
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 def build_docs(version='dev', **kwargs):
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   doc_dir = kwargs.get('doc_dir', os.path.dirname(os.path.realpath(__file__)))
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-- 
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2.26.2
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