Make install fails for FreeBSD x64 display driver 470.256.02: src/nvidia/opt_global.h file not found

Gaming and Visualization Technologies General Topics and Other SDKs Drivers - Linux, Windows, MacOS
1

From https://www.nvidia.com/en-us/drivers/details/226762/:

tar xzf NVIDIA-FreeBSD-x86_64-470.256.02.tar.gz && cd NVIDIA-FreeBSD-x86_64-470.256.02 && make install

  1. the documented filename is wrong – the Download button provides a .tar.xz file, not .tar.gz
  2. make install fails as shown below.
root@fourteen-pkgbase:/home/grahamperrin/Downloads # fetch https://us.download.nvidia.com/XFree86/FreeBSD-x86_64/470.256.02/NVIDIA-FreeBSD-x86_64-470.256.02.tar.xz
fetch: https://us.download.nvidia.com/XFree86/FreeBSD-x86_64/470.256.02/NVIDIA-FreeBSD-x86_64-470.256.02.tar.xz: size of remote file is not known
NVIDIA-FreeBSD-x86_64-470.256.02.tar.xz                 94 MB 1864 kBps    52s
root@fourteen-pkgbase:/home/grahamperrin/Downloads # tar xzf NVIDIA-FreeBSD-x86_64-470.256.02.tar.gz && cd NVIDIA-FreeBSD-x86_64-470.256.02 && make install
tar: Error opening archive: Failed to open 'NVIDIA-FreeBSD-x86_64-470.256.02.tar.gz'
root@fourteen-pkgbase:/home/grahamperrin/Downloads # tar xzf NVIDIA-FreeBSD-x86_64-470.256.02.tar.xz && cd NVIDIA-FreeBSD-x86_64-470.256.02 && make install
===> src (install)
===> src/nvidia (install)
cc  -O2 -pipe -DNV_VERSION_STRING=\"470.256.02\" -D__KERNEL__ -DNVRM -Wno-unused-function -Wuninitialized -O2 -fno-strict-aliasing -mno-red-zone -mcmodel=kernel -UDEBUG -U_DEBUG -DNDEBUG -DNV_SPECTRE_V2=1 -DNV_KERNEL_INTERFACE_LAYER -Werror=undef  -Werror -D_KERNEL -DKLD_MODULE -nostdinc  -I. -I../common/inc -include /home/grahamperrin/Downloads/NVIDIA-FreeBSD-x86_64-470.256.02/src/nvidia/opt_global.h -I. -I/usr/src/sys -I/usr/src/sys/contrib/ck/include -fno-common  -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -fdebug-prefix-map=./machine=/usr/src/sys/amd64/include -fdebug-prefix-map=./x86=/usr/src/sys/x86/include -fdebug-prefix-map=./i386=/usr/src/sys/i386/include      -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float  -fno-asynchronous-unwind-tables -ffreestanding -fwrapv -fstack-protector -Wall -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wcast-qual -Wundef -Wno-pointer-sign -D__printf__=__freebsd_kprintf__ -Wmissing-include-dirs -fdiagnostics-show-option -Wno-unknown-pragmas -Wno-error=tautological-compare -Wno-error=empty-body -Wno-error=parentheses-equality -Wno-error=unused-function -Wno-error=pointer-sign -Wno-error=shift-negative-value -Wno-address-of-packed-member -Wno-format-zero-length   -mno-aes -mno-avx  -std=gnu99 -c nvidia_acpi.c -o nvidia_acpi.o
<built-in>:1:10: fatal error: '/home/grahamperrin/Downloads/NVIDIA-FreeBSD-x86_64-470.256.02/src/nvidia/opt_global.h' file not found
    1 | #include "/home/grahamperrin/Downloads/NVIDIA-FreeBSD-x86_64-470.256.02/src/nvidia/opt_global.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
*** Error code 1

Stop.
make[2]: stopped in /home/grahamperrin/Downloads/NVIDIA-FreeBSD-x86_64-470.256.02/src/nvidia
*** Error code 1

Stop.
make[1]: stopped in /home/grahamperrin/Downloads/NVIDIA-FreeBSD-x86_64-470.256.02/src
*** Error code 1

Stop.
make: stopped in /home/grahamperrin/Downloads/NVIDIA-FreeBSD-x86_64-470.256.02
root@fourteen-pkgbase:/home/grahamperrin/Downloads/NVIDIA-FreeBSD-x86_64-470.256.02 #