Trying to start freshly built sage on Cygwin (Windows 7) I get:

Dima@SPMS-DIMA-W7 /usr/local/sage/sage-4.7.2
$ ./sage
----------------------------------------------------------------------
| Sage Version 4.7.2, Release Date: 2011-10-29                       |
| Type notebook() for the GUI, and license() for information.        |
----------------------------------------------------------------------
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)

/usr/local/sage/sage-4.7.2/local/bin/<string> in <module>()

/usr/local/sage/sage-4.7.2/local/lib/python2.6/site-packages/sage/misc/preparser_ipython.py
 
in <module>()
      6 
###########################################################################
      7
----> 8 import sage.misc.interpreter
      9
     10 import preparser

/usr/local/sage/sage-4.7.2/local/lib/python2.6/site-packages/sage/misc/interpreter.py
 
in <module>()
    100
    101 import os
--> 102 import log
    103 import re
    104

/usr/local/sage/sage-4.7.2/local/lib/python2.6/site-packages/sage/misc/log.py 
in <module>()
     63
     64 import interpreter
---> 65 import latex
     66 import misc
     67

/usr/local/sage/sage-4.7.2/local/lib/python2.6/site-packages/sage/misc/latex.py 
in <module>()
     63 import types
     64
---> 65 from misc import tmp_dir, graphics_filename
     66 import sage_eval
     67 from sage.misc.sage_ostools import have_program

/usr/local/sage/sage-4.7.2/local/lib/python2.6/site-packages/sage/misc/misc.py 
in <module>()
     36
     37 import operator, os, stat, socket, sys, signal, time, weakref, 
resource, math
---> 38 import sage.misc.prandom as random
     39
     40 from banner import version, banner

/usr/local/sage/sage-4.7.2/local/lib/python2.6/site-packages/sage/misc/prandom.py
 
in <module>()
     54 # setting seeds should only be done through sage.misc.randstate .
     55
---> 56 from sage.misc.randstate import current_randstate
     57
     58 def _pyrand():

ImportError: No such file or directory
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/sage/sage-4.7.2/local/lib/python2.6/site-packages/IPython/ipmaker.pyc
 
in force_import(modname, force_reload)
     61         reload(sys.modules[modname])
     62     else:
---> 63         __import__(modname)
     64
     65

/usr/local/sage/sage-4.7.2/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)

/usr/local/sage/sage-4.7.2/local/lib/python2.6/site-packages/sage/misc/misc.py 
in <module>()
     36
     37 import operator, os, stat, socket, sys, signal, time, weakref, 
resource, math
---> 38 import sage.misc.prandom as random
     39
     40 from banner import version, banner

/usr/local/sage/sage-4.7.2/local/lib/python2.6/site-packages/sage/misc/prandom.py
 
in <module>()
     54 # setting seeds should only be done through sage.misc.randstate .
     55
---> 56 from sage.misc.randstate import current_randstate
     57
     58 def _pyrand():

ImportError: No such file or directory
Error importing ipy_profile_sage - perhaps you should run %upgrade?
WARNING: Loading of ipy_profile_sage failed.

<ERROR: name 'sage_prompt' is not defined>

---------------------------------------
Any idea what exactly fails?
(./sage -gap, -python, -ipython, -maxima, -lisp, -gp all work, just in 
case...)
How would you debug this?

Thanks,
Dima

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