I am using a VirtualBox Sage-6.2 and wanted to upgrade sage.
It failed trying to build conway_polynomials.

[sage@sagevm ~]$ python -m bitset
/usr/bin/python: No module named bitset
[sage@sagevm ~]$ python -V
Python 2.6.6


Thread model: posix
gcc version 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC)
****************************************************
Traceback (most recent call last):
  File "./spkg-install", line 4, in <module>
    from sage.all import save
  File "/home/sage/sage-6.2/local/lib/python2.7/site-packages/sage/all.py",
line 87, in <module>
    from sage.misc.all       import *         # takes a while
  File "/home/sage/sage-6.2/local/lib/python2.7/site-packages/sage/misc/all.py",
line 172, in <module>
    from bitset import FrozenBitset, Bitset
ImportError: No module named bitset

real    0m33.122s
user    0m2.768s
sys     0m17.005s
************************************************************************
Error installing package conway_polynomials-0.4.p0
************************************************************************
Please email sage-devel (http://groups.google.com/group/sage-devel)
explaining the problem and including the relevant part of the log file
  /home/sage/sage-6.2/logs/pkgs/conway_polynomials-0.4.p0.log

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