在编译时k210目录下显示问题报错咋办

f:\kendryte-toolchain iscv64-unknown-elf\include\sys\signal.h:42:7: error: redefinition of 'union sigval'
union sigval {
^~~~~~
E: t-thread-v4.0.1 t-thread\include/libc/libc_signal.h:27:7: note: originally defined here
union sigval
^~~~~~
f:\kendryte-toolchain iscv64-unknown-elf\include\sys\signal.h:47:8: error: redefinition of 'struct sigevent'
struct sigevent {
^~~~~~~~
E: t-thread-v4.0.1 t-thread\include/libc/libc_signal.h:35:8: note: originally defined here
struct sigevent
^~~~~~~~
f:\kendryte-toolchain iscv64-unknown-elf\include\sys\signal.h:72:3: error: conflicting types for 'siginfo_t'
} siginfo_t;
^~~~~~~~~
E: t-thread-v4.0.1 t-thread\include/libc/libc_signal.h:54:24: note: previous declaration of 'siginfo_t' was here
typedef struct siginfo siginfo_t;

然后把f:\kendryte-toolchain iscv64-unknown-elf\include\sys目录下的signal.h删掉，又会报错

E: t-thread-v4.0.1 t-thread\include/libc/libc_signal.h:67:10: fatal error: sys/signal.h: No such file or directory
#include <sys/signal.h>