diff --git a/components/dfs/include/dfs_select.h b/components/dfs/include/dfs_select.h
index e0572c5059..17291a60dc 100644
--- a/components/dfs/include/dfs_select.h
+++ b/components/dfs/include/dfs_select.h
@@ -12,15 +12,4 @@
 
 #include <sys/select.h>
 
-#ifdef __cplusplus
-extern "C" {
 #endif
-
-int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif
-
diff --git a/components/libc/compilers/common/none-gcc/sys/types.h b/components/libc/compilers/common/none-gcc/sys/types.h
index a7c566f643..2c4c12055f 100644
--- a/components/libc/compilers/common/none-gcc/sys/types.h
+++ b/components/libc/compilers/common/none-gcc/sys/types.h
@@ -13,6 +13,7 @@
 
 #include <stdint.h>
 #include <stddef.h>
+#include <time.h>
 
 typedef int32_t          clockid_t;
 typedef int32_t          key_t;         /* Used for interprocess communication. */
diff --git a/components/libc/compilers/common/sys/select.h b/components/libc/compilers/common/sys/select.h
index db42b6ebcc..08420b0d10 100644
--- a/components/libc/compilers/common/sys/select.h
+++ b/components/libc/compilers/common/sys/select.h
@@ -12,6 +12,7 @@
 #define __SYS_SELECT_H__
 
 #include <rtconfig.h>
+#include <sys/time.h>
 #include <sys/types.h>
 
 #ifndef  FD_SETSIZE
@@ -46,4 +47,6 @@ typedef struct _types_fd_set {
 #define FD_ZERO(p)      memset((void*)(p), 0, sizeof(*(p)))
 #endif /* _SYS_TYPES_FD_SET */
 
+int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout);
+
 #endif /* __SYS_SELECT_H__ */