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user_id=99508

If you don't mind, I'll just link you to my comp.lang.python
post about it:

0310100915.359b2e09%40posting.google.com&rnum=9">http://groups.google.com/groups?q=group:comp.lang.python+solaris+7&hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=698f09f8.0310100915.359b2e09%40posting.google.com&rnum=9

That has the exact compilation error.  I've tried passing
the --disable-IPV6 option to configure (as MvL mentioned)
and it seemed to compile, but I still don't have access to
the _socket library, probably due to the second error I
mentioned.  I tried the fix in the bug #565710 (adding
runtime_library_dirs to setup.py) but to no avail.