调试RVMDK自带的例子程序systick，出现如下链接错误信息，由于是刚初学，不知是我什么忘了做，还是什么做错了
Build target 'SysTick' assembling STM32F10x.s... compiling
main.c... compiling stm32f10x_it.c... linking... SysTick.axf:
Error: L6218E: Undefined symbol FLASH_PrefetchBufferCmd (referred
from main.o). SysTick.axf: Error: L6218E: Undefined symbol
FLASH_SetLatency (referred from main.o). SysTick.axf: Error:
L6218E: Undefined symbol GPIO_Init (referred from main.o).
SysTick.axf: Error: L6218E: Undefined symbol GPIO_ReadOutputData
(referred from main.o). SysTick.axf: Error: L6218E: Undefined
symbol GPIO_Write (referred from main.o). SysTick.axf: Error:
L6218E: Undefined symbol NVIC_SetVectorTable (referred from
main.o). SysTick.axf: Error: L6218E: Undefined symbol
RCC_APB2PeriphClockCmd (referred from main.o). SysTick.axf: Error:
L6218E: Undefined symbol RCC_DeInit (referred from main.o).
SysTick.axf: Error: L6218E: Undefined symbol RCC_GetFlagStatus
(referred from main.o). SysTick.axf: Error: L6218E: Undefined
symbol RCC_GetSYSCLKSource (referred from main.o). SysTick.axf:
Error: L6218E: Undefined symbol RCC_HCLKConfig (referred from
main.o). SysTick.axf: Error: L6218E: Undefined symbol RCC_HSEConfig
(referred from main.o). SysTick.axf: Error: L6218E: Undefined
symbol RCC_PCLK1Config (referred from main.o). SysTick.axf: Error:
L6218E: Undefined symbol RCC_PCLK2Config (referred from main.o).
SysTick.axf: Error: L6218E: Undefined symbol RCC_PLLCmd (referred
from main.o). SysTick.axf: Error: L6218E: Undefined symbol
RCC_PLLConfig (referred from main.o). SysTick.axf: Error: L6218E:
Undefined symbol RCC_SYSCLKConfig (referred from main.o).
SysTick.axf: Error: L6218E: Undefined symbol RCC_WaitForHSEStartUp
(referred from main.o). SysTick.axf: Error: L6218E: Undefined
symbol SysTick_CounterCmd (referred from main.o). SysTick.axf:
Error: L6218E: Undefined symbol SysTick_ITConfig (referred from
main.o). SysTick.axf: Error: L6218E: Undefined symbol
SysTick_SetReload (referred from main.o). Target not created
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