avr/interrupt.h references the Atmel AVR which is specific to the AVR chip found on Arduino boards, Galileo is x86. The NewSoftSerial library has not yet been ported to Galileo.
Any chance of getting it ported or pointers on how to port it to Galileo. Happy to have a go!
I'm also in need of this or the standard SoftwareSerial library. Or some example code for the list of supported shields, as it would seem that some of them would require a software serial implementation.
I'm a hack, but I'll take any pointers on porting libraries to the Galileo and see what I can do.