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Yeah, you'd definitely need -fPIC on any brand of Solaris.  That test might be 
changed to

    plat = get_platform()
    if plat in (... buncha platforms ...) or "solaris" in plat:
        os.environ["CFLAGS"] = "-fPIC"

That doesn't seem to be what's happening in this case though.  I rm'd the .o 
files in .../Modules/_ctypes and tried again.  The compile commands *do* 
have -fPIC on them.  I don't think it's required on the link line.

S