如何将arduino库与标准C代码一起使用

I am using Eclipse kepler for AVR development. The code that I have is C (Open Source), and I've gotten it adjusted so it runs perfectly. My target is an ATmega2560, in the form of an arduino mega2560. Using the arduino board is strictly for hardware convenience; we are developing the hardware to be a custom board with most of the core arduino mega2560 components.I am using Eclipse kepler for AVR development.