I used platformio IDE

I did "platformio lib install 1101" (http://platformio.org/lib/show/1101/ESP8266wifi),

I installed this: http://platformio.org/lib/show/549/WebSockets (follow instructions)

I did similar things to other libraries.

When I click the platformio:build button, it still complains:

fatal error: ESP8266WiFi.h: No such file or directory fatal error:

 

ESP8266WiFiMulti.h: No such file or directory fatal error:

 

ESP8266Webserver.h: No such file or directory

I used platformio IDE

I did "platformio lib install 1101" (http://platformio.org/lib/show/1101/ESP8266wifi),

I installed this: http://platformio.org/lib/show/549/WebSockets (follow instructions)

I did similar things to other libraries.

When I click the platformio:build button, it still complains:

fatal error: ESP8266WiFi.h: No such file or directory fatal error:

ESP8266WiFiMulti.h: No such file or directory fatal error:

ESP8266Webserver.h: No such file or directory