nvidia-driver won't build with 6.2-STABLE-200705 and xorg 7.2

[jeffc at supranet.net]

The May snapshot FreeBSD 6.2-STABLE-200705 appropriately has no xorg, but after
a portsnap fetch, pkg_add -r xorg successfully (it runs) installed xorg 7.2. 
However trying to build nvidia-driver from ports fails with:

[...]
===> x11 (install)
===> x11/driver (install)
install: /usr/X11R6/lib/modules/drivers: No such file or directory
*** Error code 71

Stop in
/usr/ports/x11/nvidia-driver/work/NVIDIA-FreeBSD-x86-1.0-9746/x11/driver.
*** Error code 1

Stop in /usr/ports/x11/nvidia-driver/work/NVIDIA-FreeBSD-x86-1.0-9746/x11.
*** Error code 1

Stop in /usr/ports/x11/nvidia-driver/work/NVIDIA-FreeBSD-x86-1.0-9746.
*** Error code 1

Stop in /usr/ports/x11/nvidia-driver.
*** Error code 1

Stop in /usr/ports/x11/nvidia-driver.
foo#


/etc/make.conf WITH_NVIDIA_GL=yes per Florent seems to make no difference either
way:

# florent says must use for nvidia-driver with 7.2
WITH_NVIDIA_GL=yes


Also have a symlink:

ln -s /usr/local /usr/X11R6

Likely there's something I'm not understanding, but this should be a
relatively vanilla install which isn't working.  Clues appreciated.

Cheers,

Jeff C.