Arduino ide needs Compliler to run the program

Development Tools IDE 1.x
1

In file included from c:\users\91812\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-4-b40a506\xtensa-lx106-elf\include\c++\4.8.2\atomic:38:0,

from C:\Users\91812\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.6.3\libraries\SoftwareSerial\src/circular_queue/circular_queue.h:28,

from C:\Users\91812\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.6.3\libraries\SoftwareSerial\src/SoftwareSerial.h:27,

from E:\MinionLabs_Old\code\Minion_old\Minion_old.ino:20:

c:\users\91812\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-4-b40a506\xtensa-lx106-elf\include\c++\4.8.2\bits\c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support is currently experimental, and must be enabled with the -std=c++11 or -std=gnu++11 compiler options.

#error This file requires compiler and library support for the \

^

exit status 1
Error compiling.

2

This is odd because the -std=gnu++11 compiler option is already in use:

Have you made any modifications to the files, or added any files, under C:\Users\91812\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.6.3?