What is a compiler directive and why is it missing?

Yosys c7f1368cd273f1d84507d29548f3420a08a82702 (Fomu build) (git sha1 ecdc4d8, gcc 7.4.0-1ubuntu1~18.04.1 -fPIC -Os)

-- Parsing blink.v' using frontend verilog' --

Executing Verilog-2005 frontend: blink.v
Parsing Verilog input from blink.v' to AST representation. blink.v:119: ERROR: Unimplemented compiler directive or undefined macro BLUEPWM.
Makefile:14: recipe for target 'blink.json' failed
make: *** [blink.json] Error 1