ch32v307-r1 BSP按照README说明导入RT-Thread Studio编译报错的原因？怎么解决？

Github上下载的RT-Thread v5.0.2 ，按照ch32v307-r1 的README.md说明导入RT-Thread Studio工程后，编译报错：

../rt-thread/libcpu/risc-v/common/cpuport.h:17:10: fatal error: rtconfig.h: No such file or directory
#include
^~~~~~~~~~~~
compilation terminated.
make: *** [rt-thread/libcpu/risc-v/common/subdir.mk:36: rt-thread/libcpu/risc-v/common/context_gcc.o] Error 1
make: *** Waiting for unfinished jobs....