FreeBSD 12 release (RTX2070) make install Display driver “430.14” error ,“stdarg.h” not found!

FreeBSD 12 release (RTX2070) make install Display driver “430.14” error ,“stdarg.h” not found!
but FreeBSD 11.2 release make install 430.14 success。
in FreeBSD 12,“stdarg.h” file seem exit , /usr/include/stdarg.h,/usr/include/machine/stdarg.h,link file to x86/stdarg.h;but the content is different from stdarg.h in FreeBSD 11.2.
someone can help!thanks

https://www.freebsd.org/releases/12.0R/relnotes.html#hardware-graphics
nvidia??where

Hello!
A have the same problem!
RTX 2070SUPER
What should I do?

OS: FreeBSD 12.1 release
Driver NVIDIA-FreeBSD-x86_64-440.36
Error: “stdarg.h” not found!
The second try gives next error:
“ln: stdarg.h: File exists
Error code: 1”

Help!

maybe i miss install xorg?
currently I installed freebsd 12.1;
after installation,
i run :
pkg install xorg;
pkg install nvidia-driver-440.64;(you may pkg search nvidia,pick newest driver)
pkg install nvidia-xconfig-440.64;
run nvidia-xconfig;
add kld_list:“nvidia-modeset” in /etc/rc.conf;
seems all works well;