error: unknown type name 'd_thread_t'

Greetings, all.
Apologies in advance, if this is better suited for
freebsd-hackers_at_. But given this is only relevant to CURRENT,
I hoped it would be OK.

OK. I'm attempting to build an i386 development box on -CURRENT.
I'm stuck using a legacy nvidia card (NV-34). Yea, I know. But
that's what I have. Anyway, that necessitates my maintaining a
local copy of the now defunct x11/nvidia-driver-173 port.
I've cobbled/refined all the necessary patches; save one.
Which is what beings me here. It appears that the d_thread_t
compatibility shim provided in 5.0 was dumped in r277897.
Sadly, as a result I receive the following, when attempting
to build the port (in spite of having COMPAT_FREEBSD5 built
in to my custom kernel):

/usr/ports/x11/nvidia-driver-173/work/NVIDIA-FreeBSD-x86-173.14.39/src/nv-freebs
d.h:459:68: error: unknown type name 'd_thread_t'
int    nvidia_handle_ioctl   (struct cdev *, u_long, caddr_t, int, d_thread_t
*)
;
                                                                   ^
/usr/ports/x11/nvidia-driver-173/work/NVIDIA-FreeBSD-x86-173.14.39/src/nv-freebs
d.h:463:46: error: unknown type name 'd_thread_t'
int    nvidia_open_ctl       (struct cdev *, d_thread_t *);
                                             ^
/usr/ports/x11/nvidia-driver-173/work/NVIDIA-FreeBSD-x86-173.14.39/src/nv-freebs
d.h:464:69: error: unknown type name 'd_thread_t'
int    nvidia_open_dev       (struct nvidia_softc *, struct cdev *, d_thread_t
*
);
                                                                    ^
/usr/ports/x11/nvidia-driver-173/work/NVIDIA-FreeBSD-x86-173.14.39/src/nv-freebs
d.h:465:46: error: unknown type name 'd_thread_t'
int    nvidia_close_ctl      (struct cdev *, d_thread_t *);
                                             ^
/usr/ports/x11/nvidia-driver-173/work/NVIDIA-FreeBSD-x86-173.14.39/src/nv-freebs
d.h:466:69: error: unknown type name 'd_thread_t'
int    nvidia_close_dev      (struct nvidia_softc *, struct cdev *, d_thread_t
*
);

Is there any way around this?

Thanks for any, and all help with this!

--Chris

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