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probleme execution sagemaths

bonjours,
A chaque fois que je lance la commande

sage

dans le terminal j'ai toujours ce message:

$ sage
----------------------------------------------------------------------
| Sage Version 4.7.1, Release Date: 2011-08-11                       |
| Type notebook() for the GUI, and license() for information.        |
----------------------------------------------------------------------
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)

/usr/local/share/sage-4.7.1/local/bin/<string> in <module>()

ImportError: No module named sage.misc.preparser_ipython
WARNING: Failure executing code: 'import sage.misc.preparser_ipython;  sage.misc.preparser_ipython.magma_colon_equals=True'
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)

/usr/local/share/sage-4.7.1/local/lib/python2.6/site-packages/IPython/ipmaker.pyc in force_import(modname)
     64         reload(sys.modules[modname])
     65     else:
---> 66         __import__(modname)
     67 
     68 

/usr/local/share/sage-4.7.1/local/bin/ipy_profile_sage.py in <module>()
      1 import os
      2 if 'SAGE_CLEAN' not in os.environ:
----> 3     import sage.misc.misc
      4     from sage.misc.interpreter import preparser, _ip
      5     preparser(True)

ImportError: No module named sage.misc.misc
Error importing ipy_profile_sage - perhaps you should run %upgrade?
WARNING: Loading of ipy_profile_sage failed.

WARNING: Readline services not available on this platform.
WARNING: The auto-indent feature requires the readline library
<ERROR: name 'sage_prompt' is not defined>

Ps:J'ai installe sagemath via la compilation des codes sources.

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On ne va jamais aussi loin que lorsqu'on ne sait pas où l'on va.