v8 on AIX5.2

Hi,

I'm trying to install, postgreSQL v8 beta2 on AIX5.2,
and I have one problem:


configure refuses to see AIX5.2 like as an OS assuming multithreading,


any idea to resolve it ?

thanks,

Frédéric
PS: ./configure OK with --enable-thread-safety-force option but gmake fails