diff --git a/components/libc/compilers/armlibc/sys/README.md b/components/libc/compilers/armlibc/sys/README.md
deleted file mode 100644
index 7ad10a7d431f774f6a073662e322aeb61123b641..0000000000000000000000000000000000000000
--- a/components/libc/compilers/armlibc/sys/README.md
+++ /dev/null
@@ -1 +0,0 @@
-Because Keil MDK leaks some system header file, we put them in here. 
\ No newline at end of file
diff --git a/components/libc/compilers/armlibc/sys/errno.h b/components/libc/compilers/armlibc/sys/errno.h
deleted file mode 100644
index 74cc986f7ce883a2b0f46bc3ce245cbb4850c1b4..0000000000000000000000000000000000000000
--- a/components/libc/compilers/armlibc/sys/errno.h
+++ /dev/null
@@ -1,14 +0,0 @@
-/*
- * Copyright (c) 2006-2021, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- */
-#ifndef SYS_ERRNO_H__
-#define SYS_ERRNO_H__
-
-#include <rtthread.h>
-
-#endif
diff --git a/components/libc/compilers/common_except_gcc/readme.md b/components/libc/compilers/common_except_gcc/readme.md
new file mode 100644
index 0000000000000000000000000000000000000000..15f8e60d59fa6be97a21b04acd96a0b45a620b6a
--- /dev/null
+++ b/components/libc/compilers/common_except_gcc/readme.md
@@ -0,0 +1,3 @@
+## Attentions
+
+This folder is "common" for armlibc and dlib.
\ No newline at end of file
diff --git a/components/libc/compilers/dlib/sys/README.md b/components/libc/compilers/dlib/sys/README.md
deleted file mode 100644
index 4f0d203180961def3d3b91efb1dbf692f04b0101..0000000000000000000000000000000000000000
--- a/components/libc/compilers/dlib/sys/README.md
+++ /dev/null
@@ -1 +0,0 @@
-Because IAR leaks some system header file, we put them in here. 
\ No newline at end of file
diff --git a/components/libc/compilers/dlib/sys/errno.h b/components/libc/compilers/dlib/sys/errno.h
deleted file mode 100644
index 54a1d33cd06629897dfe52dd9d3419744bffe12f..0000000000000000000000000000000000000000
--- a/components/libc/compilers/dlib/sys/errno.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * Copyright (c) 2006-2021, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2019-07-08     Bernard      The first version
- */
-
-#ifndef SYS_ERRNO_H__
-#define SYS_ERRNO_H__
-
-#include <errno.h>
-
-#endif
diff --git a/components/libc/compilers/dlib/sys/signal.h b/components/libc/compilers/dlib/sys/signal.h
deleted file mode 100644
index a30235f2b2ff677e62d6ba9c09086183061faa5c..0000000000000000000000000000000000000000
--- a/components/libc/compilers/dlib/sys/signal.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * Copyright (c) 2006-2021, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2019-07-08     Bernard      The first version
- */
-
-#ifndef SYS_SIGNAL_H__
-#define SYS_SIGNAL_H__
-
-#include <libc/libc_signal.h>
-
-#endif