Ever get the dreaded error: fatal error: avr/pgmspace.h:

Ever get the dreaded error:
fatal error: avr/pgmspace.h: No such file or directory

Well then replace
#if FASTLED_INCLUDE_PGMSPACE == 1
#include <avr/pgmspace.h>
#endif

with
#if (defined(AVR))
#include <avr\pgmspace.h>
#else
#include <pgmspace.h>
#endif

I’ve had this with lots of libraries, and used this fix, but not needed it with FastLED.