Added below line to fastboot.h to avoid this error buidling on macOS Sequoia:

...undeclared function 'fb_queue_check',ISO C99 and later do not support implicit function declarations -Wimplicit-function-declaration...

void fb_queue_check(const char *ptn);

This is a version of Android's "fastboot" for the Kindle 4, Kindle Touch and Kindle PaperWhite. It will NOT work with Android phones.

To build the project on OS X, simply run

make