make ARCH=x86_64 CROSS_COMPILE= -C /lib/modules/4.15.7-gentoo-r1/build M=/root/downloads/rtl8723de  modules
make[1]: Entering directory '/usr/src/linux-4.15.7-gentoo-r1'
  CC [M]  /root/downloads/rtl8723de/core/rtw_cmd.o
In file included from /root/downloads/rtl8723de/include/osdep_service.h:42:0,
                 from /root/downloads/rtl8723de/include/drv_types.h:32,
                 from /root/downloads/rtl8723de/core/rtw_cmd.c:22:
/root/downloads/rtl8723de/include/osdep_service_linux.h: In function ‘_init_timer’:
/root/downloads/rtl8723de/include/osdep_service_linux.h:287:8: error: ‘_timer {aka struct timer_list}’ has no member named ‘data’
  ptimer->data = (unsigned long)cntx;
        ^~
/root/downloads/rtl8723de/include/osdep_service_linux.h:288:2: error: implicit declaration of function ‘init_timer’ [-Werror=implicit-function-declaration]
  init_timer(ptimer);
  ^~~~~~~~~~
cc1: some warnings being treated as errors
make[2]: *** [scripts/Makefile.build:317: /root/downloads/rtl8723de/core/rtw_cmd.o] Error 1
make[1]: *** [Makefile:1509: _module_/root/downloads/rtl8723de] Error 2
make[1]: Leaving directory '/usr/src/linux-4.15.7-gentoo-r1'
make: *** [Makefile:1884: modules] Error 2