unable to make sphinx-doc [closed]

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hi,I am using Ubuntu12.04+groovy.I am a newbie. I followed the tutorial ork(object recogniton kitchen) to install it from source . when I follow the step:Building the documentation,run the comand:sudo pip install -U breathe catkin-sphinx sphinxcontrib-programoutput ,I got some warning like

exbot@baogege:~/ork$ sudo pip install -U breathe catkin-sphinx sphinxcontrib-programoutput [sudo] password for exbot: Downloading/unpacking breathe Running setup.py egg_info for package breathe

Downloading/unpacking catkin-sphinx Running setup.py egg_info for package catkin-sphinx

Downloading/unpacking sphinxcontrib-programoutput Running setup.py egg_info for package sphinxcontrib-programoutput

warning: no files found matching '*.txt' under directory 'tests'

Downloading/unpacking Sphinx>=1.0.7 (from breathe) Running setup.py egg_info for package Sphinx

warning: no files found matching 'TODO'
no previously-included directories found matching 'doc/_build'

Downloading/unpacking docutils>=0.5 (from breathe) Running setup.py egg_info for package docutils

warning: no files found matching 'MANIFEST'
warning: no files found matching '*' under directory 'extras'
warning: no previously-included files matching '.cvsignore' found under directory '*'

and then,I ran make sphinx-doc I got error like this:

root@baogege:~/ork/build# make sphinx-doc /home/exbot/ork/build/catkin_generated/env_cached.sh: 16: exec: /usr/bin/sphinx-build: not found make[3]: * [object_recognition_ros-sphinx] Error 127 make[2]: [object_recognition_ros/CMakeFiles/object_recognition_ros-sphinx.dir/all] Error 2 make[1]: [object_recognition_core/CMakeFiles/sphinx-doc.dir/rule] Error 2 make: * [sphinx-doc] Error 2

I am very grateful for who can tell me why and to provide help