diff --git a/bsp/abstract-machine/include/extra.h b/bsp/abstract-machine/include/extra.h
index 27c72f4a51ce..58ee47d35758 100644
--- a/bsp/abstract-machine/include/extra.h
+++ b/bsp/abstract-machine/include/extra.h
@@ -1,8 +1,7 @@
-typedef long suseconds_t;
-typedef unsigned long useconds_t;
-#include <sys/types.h>
+
 
 #ifdef __ISA_NATIVE__
+#include <sys/types.h>
 // rename posix API to avoid conflict with glibc in native
 #define open      rt_open
 #define creat     rt_creat
@@ -34,5 +33,7 @@ typedef unsigned long useconds_t;
 #define getcwd    rt_getcwd
 
 #define gettimeofday rt_gettimeofday
-
+#else
+typedef long suseconds_t;
+typedef unsigned long useconds_t;
 #endif
diff --git a/components/libc/compilers/common/cstdlib.c b/components/libc/compilers/common/cstdlib.c
index 64bfbb10e0c0..8c947b7886e7 100644
--- a/components/libc/compilers/common/cstdlib.c
+++ b/components/libc/compilers/common/cstdlib.c
@@ -8,6 +8,7 @@
  * 2021-02-15     Meco Man     first version
  */
 
+#include <stddef.h>
 #include <rtthread.h>
 
 #define DBG_TAG    "stdlib"
diff --git a/components/libc/compilers/common/cstring.c b/components/libc/compilers/common/cstring.c
index 59c516d273e8..ff2dfaad26b9 100644
--- a/components/libc/compilers/common/cstring.c
+++ b/components/libc/compilers/common/cstring.c
@@ -48,12 +48,12 @@ void explicit_bzero(void* s, size_t n)
 
 char* index(const char* s, int c)
 {
-    return strchr(s, c);
+    return (char*)strchr(s, c);
 }
 
 char* rindex(const char* s, int c)
 {
-    return strrchr(s, c);
+    return (char*)strrchr(s, c);
 }
 
 int ffs(int i)
diff --git a/components/libc/compilers/common/include/sys/select.h b/components/libc/compilers/common/include/sys/select.h
index 32ce39c287e2..71d7360f898d 100644
--- a/components/libc/compilers/common/include/sys/select.h
+++ b/components/libc/compilers/common/include/sys/select.h
@@ -14,7 +14,8 @@
 
 #include <rtconfig.h>
 #include <sys/types.h>
-#include <sys/time.h>
+
+struct timeval;
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/components/libc/compilers/common/include/sys/time.h b/components/libc/compilers/common/include/sys/time.h
index 87be959715e2..cba0bbc4c18f 100644
--- a/components/libc/compilers/common/include/sys/time.h
+++ b/components/libc/compilers/common/include/sys/time.h
@@ -48,7 +48,7 @@ struct timezone
     int tz_dsttime;       /* type of dst correction */
 };
 
-#ifndef _TIMEVAL_DEFINED
+#if !defined (_TIMEVAL_DEFINED) &&!defined (__timeval_defined)
 #define _TIMEVAL_DEFINED
 struct timeval
 {
diff --git a/components/utilities/utest/utest.c b/components/utilities/utest/utest.c
index 3c91fa81667c..8cb7d625dd96 100644
--- a/components/utilities/utest/utest.c
+++ b/components/utilities/utest/utest.c
@@ -149,8 +149,8 @@ static const char *file_basename(const char *file)
     char *end_ptr = RT_NULL;
     char *rst = RT_NULL;
 
-    if (!((end_ptr = strrchr(file, '\\')) != RT_NULL || \
-        (end_ptr = strrchr(file, '/')) != RT_NULL) || \
+    if (!((end_ptr = (char*)strrchr(file, '\\')) != RT_NULL || \
+        (end_ptr = (char*)strrchr(file, '/')) != RT_NULL) || \
         (rt_strlen(file) < 2))
     {
         rst = (char *)file;