@taazz, you are right about the explanation. The problem comes from 32-64 bit issue. I tested TurboBird with the 10.6.8 (Snow Leopard) which is a 32 bit OS. The second try was on 10.8.2 (Mountain Lion) which is a 64 bit OS. So If I compile the source with the 64 bit FPC, there will be no problem with the 10.8. I quess.
Thanks.