Can't compile without COMPAT_43 on i386

[Mike Jakubik]

I can compile an amd64 kernel just fine without the option COMPAT_43, 
but not i386. Why is this?

/usr/src/sys/modules/linux/../../i386/linux/linux_sysvec.c:36:2: #error 
"Unable to compile Linux-emulator due to missing COMPAT_43 option!"
mkdep: compile failed

I don't want or need the Linux-emulator.