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
> 
> 
>
['https://arduino.stackexchange.com/questions/23809', 'https://arduino.stackexchange.com', 'https://arduino.stackexchange.com/users/20742/']
Have you overridden `lib_dir` in `platformio.ini`? If yes, please remove it.
Make sure **ESP8266WiFi.h**, **ESP8266WiFiMulti.h**, **ESP8266Webserver.h** files are located in the same directory where your \*.uno file present.