环境：
RT-Thread Studio版本: 2.0.0构建ID: 202012101600OS: Windows 10, v.10.0, x86_64 / win32Java version: 1.8.0_144
创建基于art_pi_factory项目，添加了MbedTLS软件包，编译的时候，提示‘DIR’类型未定义错误。
更换了MbedTLS的几个版本都是这样。
这是什么原因？
搜了一下论坛似乎没有人提到过这个问题。
log：
arm-none-eabi-gcc "../packages/mbedtls-latest/mbedtls/library/x509write_csr.c"In file included from d:\rt-threadstudio\repo\extract\toolchain_support_packages\arm\gnu_tools_for_arm_embedded_processors\5.4.1\arm-none-eabi\include\dirent.h:7:0, from ../packages/mbedtls-latest/mbedtls/library/x509_crt.c:74:D:\RT-ThreadStudio\workspace\SmartWindow\rt-thread\components\libc\compilers\newlib/sys/dirent.h:53:25: error: unknown type name 'DIR' int closedir(DIR *); ^D:\RT-ThreadStudio\workspace\SmartWindow\rt-thread\components\libc\compilers\newlib/sys/dirent.h:54:1: error: unknown type name 'DIR' DIR *opendir(const char *); ^D:\RT-ThreadStudio\workspace\SmartWindow\rt-thread\components\libc\compilers\newlib/sys/dirent.h:55:24: error: unknown type name 'DIR' struct dirent *readdir(DIR *); ^D:\RT-ThreadStudio\workspace\SmartWindow\rt-thread\components\libc\compilers\newlib/sys/dirent.h:56:26: error: unknown type name 'DIR' int readdir_r(DIR *, struct dirent *, struct dirent **); ^D:\RT-ThreadStudio\workspace\SmartWindow\rt-thread\components\libc\compilers\newlib/sys/dirent.h:57:26: error: unknown type name 'DIR' void rewinddir(DIR *); ^D:\RT-ThreadStudio\workspace\SmartWindow\rt-thread\components\libc\compilers\newlib/sys/dirent.h:58:24: error: unknown type name 'DIR' void seekdir(DIR *, long int); ^D:\RT-ThreadStudio\workspace\SmartWindow\rt-thread\components\libc\compilers\newlib/sys/dirent.h:59:24: error: unknown type name 'DIR' long telldir(DIR *); ^../packages/mbedtls-latest/mbedtls/library/x509_crt.c: In function 'mbedtls_x509_crt_parse_path':../packages/mbedtls-latest/mbedtls/library/x509_crt.c:1182:5: error: unknown type name 'DIR' DIR *dir = opendir( path ); ^../packages/mbedtls-latest/mbedtls/library/x509_crt.c:1195:22: warning: implicit declaration of function 'readdir' [-Wimplicit-function-declaration] while( ( entry = readdir( dir ) ) != NULL ) ^../packages/mbedtls-latest/mbedtls/library/x509_crt.c:1195:20: warning: assignment makes pointer from integer without a cast [-Wint-conversion] while( ( entry = readdir( dir ) ) != NULL ) ^../packages/mbedtls-latest/mbedtls/library/x509_crt.c:1198:57: error: dereferencing pointer to incomplete type 'struct dirent' "%s/%s", path, entry->d_name ); ^../packages/mbedtls-latest/mbedtls/library/x509_crt.c:1224:5: warning: implicit declaration of function 'closedir' [-Wimplicit-function-declaration] closedir( dir ); ^make: *** [packages/mbedtls-latest/mbedtls/library/subdir.mk:228: packages/mbedtls-latest/mbedtls/library/x509_crt.o] Error 1make: *** Waiting for unfinished jobs...."make -j4 all" terminated with exit code 2. Build might be incomplete.12:21:56 Build Failed. 11 errors, 4 warnings. (took 12m:51s.306ms)
