diff --git a/components/esp8266/source/startup.c b/components/esp8266/source/startup.c
index 0f7c6358..95f16265 100644
--- a/components/esp8266/source/startup.c
+++ b/components/esp8266/source/startup.c
@@ -34,7 +34,7 @@
 #include "FreeRTOS.h"
 #include "task.h"
 
-#if defined(CONFIG_NEWLIB_LIBRARY_LEVEL_NORMAL) || defined(CONFIG_NEWLIB_LIBRARY_LEVEL_NANO)
+#ifndef CONFIG_NEWLIB_LIBRARY_CUSTOMER
 #include "esp_newlib.h"
 #endif
 
@@ -163,7 +163,7 @@ void call_start_cpu(size_t start_addr)
     assert(__esp_os_init() == 0);
 #endif
 
-#if defined(CONFIG_NEWLIB_LIBRARY_LEVEL_NORMAL) || defined(CONFIG_NEWLIB_LIBRARY_LEVEL_NANO)
+#ifndef CONFIG_NEWLIB_LIBRARY_CUSTOMER
     esp_newlib_init();
 #endif
 
diff --git a/components/freertos/port/esp8266/include/freertos/portmacro.h b/components/freertos/port/esp8266/include/freertos/portmacro.h
index 673c16b2..4abc6267 100644
--- a/components/freertos/port/esp8266/include/freertos/portmacro.h
+++ b/components/freertos/port/esp8266/include/freertos/portmacro.h
@@ -42,7 +42,7 @@ extern "C" {
 #include    "xtensa_rtos.h"
 
 #if defined(configUSE_NEWLIB_REENTRANT) && configUSE_NEWLIB_REENTRANT == 1
-#if defined(CONFIG_NEWLIB_LIBRARY_LEVEL_NORMAL) || defined(CONFIG_NEWLIB_LIBRARY_LEVEL_NANO)
+#ifndef CONFIG_NEWLIB_LIBRARY_CUSTOMER
 #include "esp_newlib.h"
 
 #define _impure_ptr _global_impure_ptr
diff --git a/components/newlib/CMakeLists.txt b/components/newlib/CMakeLists.txt
index 9a002cba..ec17652a 100644
--- a/components/newlib/CMakeLists.txt
+++ b/components/newlib/CMakeLists.txt
@@ -1,5 +1,5 @@
 set(COMPONENT_SRCDIRS newlib/port)
-set(COMPONENT_ADD_INCLUDEDIRS newlib/include newlib/port/include)
+set(COMPONENT_ADD_INCLUDEDIRS newlib/port/include newlib/include)
 
 
 if(CONFIG_NEWLIB_LIBRARY_LEVEL_NANO)
diff --git a/components/newlib/Kconfig b/components/newlib/Kconfig
index 14d11fc5..64329ff8 100644
--- a/components/newlib/Kconfig
+++ b/components/newlib/Kconfig
@@ -1,18 +1,8 @@
 menu "Newlib"
 
-config NEWLIB_ENABLE
-    bool "Enable newlib"
-    default y
-    help
-        If you need use you own C library, make this option disable. The libraries and
-        header files at this component will not be used.
-
-        Note: ABI of the C library of your own must be same as SDK.
-
 choice NEWLIB_LIBRARY_LEVEL
     prompt "newlib level"
     default NEWLIB_LIBRARY_LEVEL_FLOAT_NANO
-    depends on NEWLIB_ENABLE
     help
         Choose newlib library level.
 
@@ -50,6 +40,14 @@ config NEWLIB_LIBRARY_LEVEL_FLOAT_NANO
         If you do not need 64-bit integer formatting support and C99 features, but need float formats,
         select this option.
 
+config NEWLIB_LIBRARY_CUSTOMER
+    bool "customer"
+    help
+        If you need use you own C library, select this option. The libraries and
+        header files at this component will not be used.
+
+        Note: ABI of the C library of your own must be same as SDK.
+
 endchoice
 
 endmenu
diff --git a/components/newlib/Makefile.projbuild b/components/newlib/Makefile.projbuild
index bdb60c01..4b16af7f 100644
--- a/components/newlib/Makefile.projbuild
+++ b/components/newlib/Makefile.projbuild
@@ -1,2 +1,9 @@
-CFLAGS += -D_CLOCKS_PER_SEC_=CONFIG_FREERTOS_HZ -D_POSIX_THREADS=1 -D_UNIX98_THREAD_MUTEX_ATTRIBUTES=1
-CPPFLAGS += -D_CLOCKS_PER_SEC_=CONFIG_FREERTOS_HZ -D_POSIX_THREADS=1 -D_UNIX98_THREAD_MUTEX_ATTRIBUTES=1
+ifndef CONFIG_NEWLIB_LIBRARY_CUSTOMER
+
+NEWLIB_FLAGS := -D_CLOCKS_PER_SEC_=CONFIG_FREERTOS_HZ \
+                -D_POSIX_THREADS=1 \
+                -D_UNIX98_THREAD_MUTEX_ATTRIBUTES=1
+
+CFLAGS += $(NEWLIB_FLAGS)
+CPPFLAGS += $(NEWLIB_FLAGS)
+endif
diff --git a/components/newlib/component.mk b/components/newlib/component.mk
index 9a3a4851..b432f4dd 100644
--- a/components/newlib/component.mk
+++ b/components/newlib/component.mk
@@ -1,38 +1,23 @@
 #
 # Component Makefile
 #
-COMPONENT_SRCDIRS := .
-
-ifdef CONFIG_NEWLIB_ENABLE
-
-ADD_NEW_NEWLIB := 0
+ifndef CONFIG_NEWLIB_LIBRARY_CUSTOMER
 
 ifdef CONFIG_NEWLIB_LIBRARY_LEVEL_NORMAL
-LIBC_PATH := $(COMPONENT_PATH)/newlib/lib/libc.a
-LIBM_PATH := $(COMPONENT_PATH)/newlib/lib/libm.a
-ADD_NEW_NEWLIB := 1
-else
-ifdef CONFIG_NEWLIB_LIBRARY_LEVEL_NANO
-LIBC_PATH := $(COMPONENT_PATH)/newlib/lib/libc_nano.a
-LIBM_PATH := $(COMPONENT_PATH)/newlib/lib/libm.a
-ADD_NEW_NEWLIB := 1
-else
-ifdef CONFIG_NEWLIB_LIBRARY_LEVEL_FLOAT_NANO
-LIBC_PATH := $(COMPONENT_PATH)/newlib/lib/libc_fnano.a
-LIBM_PATH := $(COMPONENT_PATH)/newlib/lib/libm.a
-ADD_NEW_NEWLIB := 1
-endif
-endif
+LIB_PATH := $(COMPONENT_PATH)/newlib/lib/libc.a $(COMPONENT_PATH)/newlib/lib/libm.a
+else ifdef CONFIG_NEWLIB_LIBRARY_LEVEL_NANO
+LIB_PATH := $(COMPONENT_PATH)/newlib/lib/libc_nano.a $(COMPONENT_PATH)/newlib/lib/libm.a
+else ifdef CONFIG_NEWLIB_LIBRARY_LEVEL_FLOAT_NANO
+LIB_PATH := $(COMPONENT_PATH)/newlib/lib/libc_fnano.a $(COMPONENT_PATH)/newlib/lib/libm.a
 endif
 
-ifeq ($(ADD_NEW_NEWLIB),1)
-COMPONENT_ADD_INCLUDEDIRS += newlib/include newlib/port/include
+COMPONENT_ADD_INCLUDEDIRS += newlib/port/include newlib/include
 COMPONENT_SRCDIRS += newlib/port
-COMPONENT_ADD_LDFLAGS := $(LIBC_PATH) $(LIBM_PATH) -lnewlib
+COMPONENT_ADD_LDFLAGS := $(LIB_PATH) -lnewlib
+COMPONENT_ADD_LINKER_DEPS := $(LIB_PATH)
+
 ifdef CONFIG_NEWLIB_LIBRARY_LEVEL_FLOAT_NANO
 COMPONENT_ADD_LDFLAGS := $(COMPONENT_ADD_LDFLAGS) -u _printf_float -u _scanf_float
 endif
-COMPONENT_ADD_LINKER_DEPS := $(LIBC_PATH) $(LIBM_PATH)
-endif
 
-endif
\ No newline at end of file
+endif # CONFIG_NEWLIB_LIBRARY_CUSTOMER
\ No newline at end of file