RFM69 Struct_receive example SS_FLASHMEM was not declared in this scope

Just tried to compile the example sketch Struct_receive from RFM69 with Arduino Uno but I keep getting stuck with error SS_FLASHMEM was not declared in this scope. It seems to be a problem in line 57:
SPIFlash flash(SS_FLASHMEM, 0xEF30); //EF40 for 16mbit windbond chip
What to fill in there for Arduino Uno or Wemos D1?

How do we find this example? What library? Post a link to the GitHub.