ESP8266WiFi library not found - fatal error

[maxgerhardt]

@fhpa

In Arduino i could define a compiler switch called ‘ESP8266’ which lets the compiler either use just one of the libraries WIFI.h or ESP8266wifi.h.

Sounds like lib_ldf_mode = deep+ (or chain+) is needed for the library dependency finder (LDF) to be able to include the correct library. See documentation.