Interestingly enough,
Code:
[disappearedng@192 /usr/ports/emulators/linux_base-fc4]$ pkg_info | grep linux_base
linux_base-fc-4_13 Base set of packages needed in Linux mode (for i386/amd64)
Unless I have deinstalled it and reinstalled it. So I guess libthread.so.0 does not come with linux_base-fc4 ?