[arch-general] How can I change thunderbird profile dir form .thunderbird to .mozilla/thunderbird?

Is there any compile flag or something I could alter? I think that would be easy to do. I just want to clean my home folder, backup firefox and thunderbird data. I only want to backup a .mozilla directory and not .mozilla and .thunderbird them two. So,anyone knows? Besides, I don't want to symlink .mozilla/thunderbird to .thunderbird, that won't solve the problem, I am willing to recomplie the whole thunderbird if necessary. Regards, Techlive Zheng