FSM is not AVR specific, but a warning is generated on other target platforms

[WayneKeenan]

WARNING: library arduino-fsm claims to run on (avr) architecture(s) and may be incompatible with your current board which runs on (esp8266) architecture(s).

[per1234]

This also will cause the examples to be put under File > Examples > INCOMPATIBLE > arduino-fsm when any non-avr board is selected. The solution is to change https://github.com/jonblack/arduino-fsm/blob/master/library.properties#L9 from:

architectures=avr

to:

architectures=*

[exothink]

runs fine on the Stm32f103/bluepill w/ stm32duino