diff --git a/doc/build.py b/doc/build.py
index 95264412..9f752889 100755
--- a/doc/build.py
+++ b/doc/build.py
@@ -36,7 +36,6 @@ def build_docs():
   # available on Travis is broken (see #207).
   try:
     distribute_version = get_distribution('distribute').version
-    print('distribute version: ' + distribute_version)
     if LooseVersion(distribute_version) <= LooseVersion('0.6.24'):
       print("Updating distribute")
       check_call(['pip', 'install', '--upgrade', 'distribute'])
@@ -48,13 +47,6 @@ def build_docs():
               check_version='1.4a0.dev-20151013')
   pip_install('michaeljones/breathe',
               '511b0887293e7c6b12310bb61b3659068f48f0f4')
-  print(check_output(['pip', '--version']))
-  print(check_output(['pip', 'show', 'alabaster']))
-  print(check_output(['sphinx-build', '--version']))
-  print('PATH:', os.environ['PATH'])
-  print(check_output(['which', 'sphinx-build']))
-  import sphinx
-  print(sphinx.__version__)
   # Build docs.
   cmd = ['doxygen', '-']
   p = Popen(cmd, stdin=PIPE)