diff --git a/components/libc/compilers/armlibc/fcntl.h b/components/libc/compilers/armlibc/fcntl.h
index 80cf1b440910ca4bc57e64621eb3f025d783ef17..3e650a8471b6095e97363138316b624dca07498b 100644
--- a/components/libc/compilers/armlibc/fcntl.h
+++ b/components/libc/compilers/armlibc/fcntl.h
@@ -9,6 +9,8 @@
 #ifndef FCNTL_H__
 #define FCNTL_H__
 
+#include <rtconfig.h>
+
 #ifdef RT_USING_DFS
 #include <dfs_posix.h>
 #endif
diff --git a/components/libc/compilers/dlib/sys/unistd.h b/components/libc/compilers/dlib/sys/unistd.h
index 29f68f24f8288728d3521c2f2c2c92cb5a5e478f..9564daba8d261fb684b9745411cbbb5b06b04aac 100644
--- a/components/libc/compilers/dlib/sys/unistd.h
+++ b/components/libc/compilers/dlib/sys/unistd.h
@@ -36,4 +36,8 @@
 
 #endif
 
+
+int     isatty      (int fd);
+char *  ttyname     (int desc);
+
 #endif /* _SYS_UNISTD_H */