Unable to compile any Esp8266 Blynk sketch

Can someone please help with a problem which has appeared after a clean Win10 and Arduino install.
I am unable to compile any Esp8266 Blynk sketch, not even ones that were and are fully functional.
I tried several but all generate the same error when compiling them namely
C:\Users\doart\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.2/tools/sdk/lwip2/include/lwipopts.h:3534:2: error: #error LWIP_FEATURES must be defined.

The Blynk DHT11 example also does not compile causes the error the same as the others.
I have complied, without errors, the Blink example on Uno and ESP8266 with no errors.
I have the latest Blynk 0.6 library and tools installed.
I am totally lost.

  1. Do you have the eps8266 core installed correctly?
  2. How did you install the Arduino IDE
  3. The full output may help a bit more.
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Apologies for the delay in responding and thank you for your response.
I spent more time having a look at my setup and could not find anything wrong.
However, I decided to start installing Arduino from scratch so I did a deep uninstall removing all traces from my PC.
I downloaded the standalone IDE version 1.6.8 installed the esp8266 cored v 2.5.0.
Installed the latest Blynk libraries as well as DTH libraries and tried the DTH11 example and not all works fine thank you.

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