diff --git a/bsp/lpc408x/.config b/bsp/lpc408x/.config
index c57e7eb755..b07e256c26 100644
--- a/bsp/lpc408x/.config
+++ b/bsp/lpc408x/.config
@@ -176,14 +176,9 @@ CONFIG_RT_USING_PIN=y
 #
 # POSIX layer and C standard library
 #
-CONFIG_RT_USING_LIBC=y
+# CONFIG_RT_USING_LIBC is not set
 # CONFIG_RT_USING_PTHREADS is not set
-CONFIG_RT_USING_POSIX=y
-# CONFIG_RT_USING_POSIX_MMAP is not set
-# CONFIG_RT_USING_POSIX_TERMIOS is not set
-# CONFIG_RT_USING_POSIX_GETLINE is not set
-# CONFIG_RT_USING_POSIX_AIO is not set
-# CONFIG_RT_USING_MODULE is not set
+CONFIG_RT_LIBC_USING_TIME=y
 
 #
 # Network
diff --git a/bsp/lpc408x/rtconfig.h b/bsp/lpc408x/rtconfig.h
index d5e0c160be..25bba085a6 100644
--- a/bsp/lpc408x/rtconfig.h
+++ b/bsp/lpc408x/rtconfig.h
@@ -107,8 +107,7 @@
 
 /* POSIX layer and C standard library */
 
-#define RT_USING_LIBC
-#define RT_USING_POSIX
+#define RT_LIBC_USING_TIME
 
 /* Network */
 
diff --git a/components/libc/compilers/common/SConscript b/components/libc/compilers/common/SConscript
index a5f4a3fda6..18ff51d027 100644
--- a/components/libc/compilers/common/SConscript
+++ b/components/libc/compilers/common/SConscript
@@ -16,7 +16,7 @@ else:
 if GetDepend('RT_USING_POSIX') == False:
         SrcRemove(src, ['unistd.c'])
 
-if not GetDepend('RT_USING_MINILIBC') and GetDepend('RT_USING_LIBC'):
+if not GetDepend('RT_USING_MINILIBC') and (GetDepend('RT_USING_LIBC') or GetDepend('RT_LIBC_USING_TIME')):
 	group = DefineGroup('libc', src, depend = [''], CPPPATH = CPPPATH)
 
 Return('group')