At the very least you should change the SYS_NAME and add AFS_FBSD60_ENV to src/config/param.amd64_fbsd_53.h. And I would suggest adding the configure flags from the README. Why did you add -fPIC to the CFLAGS? I doubt very much that any linux binaries will work, because the afs syscalls are not emulated. This discussion would be better continued on openafs-devel.