samba - Apr 2010 - Samba 3.5.2 with/out aio on FreeBSD 7.2

Hi,

I have a FreeBSD 7.2 machine with Samba 3.4.5 with aio support enabled. If I
try to upgrade to Samba 3.5.2 from source aio support compiles but I receive
"Abnormal server exit: Failed to setup RT_SIGNAL_AIO handler" fatal
error
from smbd. Without aio 3.5.2 too works nice.

Any hint please what has been changed from 3.4.5 to 3.5.2 regarding aio? Or
what special compile option would be required now to enable aio?

Thanks.