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What I've found out, after some painful time on the
sourceforge compilefarm, is this:

Python svn trunk also fails to build _ctypes.so on the
solaris-x86 machine, but not on the sparc machines (both
have solaris 9, I believe).

ctypes from svn trunk *does* build also on the x86 machine,
with the system installed python2.3, also with python 2.5b2.

One difference that I found is that ctypes svn setup.py
passes '-impure-text' to the linker, while python svn (when
building the bundled ctypes) does not.