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Arduino defines some macros so you can use conditional compilation. For example these are from boards.txt:

• use ARDUINO_AVR_PROMICRO if it's specific for board variant
• use DARDUINO_ARCH_AVR if it's specific for Arduino with AVR

Also avr-gcc defines macros according to cpu settings (this should be similar for other platforms too):

• use __AVR_ATmega32U4__ if it's specific for only one MCU
• use __AVR__ if it's compatible with all AVR based MCUs

And code examples:

#if defined(__AVR_ATmega88__) || defined(__AVR_ATmega168__) || defined(__AVR_ATmega328__)
// something for ATmegaXX8 family...
#else
// ...
#endif

#ifdef __AVR__ 
// Code related to AVR
#else
// Code for other architectures
#endif