diff --git a/components/libc/compilers/dlib/sys/errno.h b/components/libc/compilers/dlib/sys/errno.h
new file mode 100644
index 0000000000..1ad4c8acc0
--- /dev/null
+++ b/components/libc/compilers/dlib/sys/errno.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2006-2018, 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
new file mode 100644
index 0000000000..22adb1228b
--- /dev/null
+++ b/components/libc/compilers/dlib/sys/signal.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2006-2018, 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
diff --git a/components/libc/compilers/dlib/sys/unistd.h b/components/libc/compilers/dlib/sys/unistd.h
index 5985a42996..29f68f24f8 100644
--- a/components/libc/compilers/dlib/sys/unistd.h
+++ b/components/libc/compilers/dlib/sys/unistd.h
@@ -34,14 +34,6 @@
 #define	_FNDELAY	_FNONBLOCK	/* non blocking I/O (4.2 style) */
 #define	_FNOCTTY	0x8000	/* don't assign a ctty on this open */
 
-#define	O_RDONLY	0		/* +1 == FREAD */
-#define	O_WRONLY	1		/* +1 == FWRITE */
-#define	O_RDWR		2		/* +1 == FREAD|FWRITE */
-#define	O_APPEND	_FAPPEND
-#define	O_CREAT		_FCREAT
-#define	O_TRUNC		_FTRUNC
-#define	O_EXCL		_FEXCL
-#define O_SYNC		_FSYNC
 #endif
 
 #endif /* _SYS_UNISTD_H */