Error while compiling library in MEGA 2560.

Hello friends.
I'm having a strange compilation error when using the Arduino MEGA. The error seems to occur in a declaration of an enum, but the curious thing is that almost all other boards (UNO, Leonardo, Yun, Explora, Nano) compilation works normally.

What's special about MEGA?

My LIB: GitHub - OpenDevice/opendevice-lib-arduino: OpenDevice lib for Arduino / ESP8266 / Etc..

Error:

In file included from /media/ricardo/Dados/Programacao/arduino-1.6.7/hardware/tools/avr/avr/include/avr/io.h:99:0,
                 from /media/ricardo/Dados/Programacao/arduino-1.6.7/hardware/tools/avr/avr/include/avr/pgmspace.h:88,
                 from /media/ricardo/Dados/Programacao/arduino-1.6.7/hardware/arduino/avr/cores/arduino/Arduino.h:28,
                 from sketch/UsbConnection.ino.cpp:1:
/media/ricardo/Dados/Codidos/Java/Projetos/OpenDevice/opendevice-hardware-libraries/arduino-sketchbook/libraries/OpenDevice/src/Command.h:31:6: error: expected identifier before '(' token
      PING                    = 20,
      ^
/media/ricardo/Dados/Codidos/Java/Projetos/OpenDevice/opendevice-hardware-libraries/arduino-sketchbook/libraries/OpenDevice/src/Command.h:31:6: error: expected '}' before '(' token
/media/ricardo/Dados/Codidos/Java/Projetos/OpenDevice/opendevice-hardware-libraries/arduino-sketchbook/libraries/OpenDevice/src/Command.h:31:6: error: expected unqualified-id before 'volatile'
      PING                    = 20,
      ^
/media/ricardo/Dados/Codidos/Java/Projetos/OpenDevice/opendevice-hardware-libraries/arduino-sketchbook/libraries/OpenDevice/src/Command.h:31:6: error: expected ')' before 'volatile'
/media/ricardo/Dados/Codidos/Java/Projetos/OpenDevice/opendevice-hardware-libraries/arduino-sketchbook/libraries/OpenDevice/src/Command.h:31:6: error: expected ')' before 'volatile'
In file included from /media/ricardo/Dados/Codidos/Java/Projetos/OpenDevice/opendevice-hardware-libraries/arduino-sketchbook/libraries/OpenDevice/src/OpenDevice.h:20:0,
                 from /media/ricardo/Dados/Codidos/Java/Projetos/OpenDevice/opendevice-hardware-libraries/arduino-sketchbook/libraries/OpenDevice/examples/UsbConnection/UsbConnection.ino:7:
/media/ricardo/Dados/Codidos/Java/Projetos/OpenDevice/opendevice-hardware-libraries/arduino-sketchbook/libraries/OpenDevice/src/Command.h:58:1: error: expected declaration before '}' token
 }
 ^

I found ....

The problem was just the MEGA 2560

It has a definition of such a PING,

Solution: Rename in my constant / enum .... all this ...

Arduino MEGA: arduino / avr / variants / mega / pins_arduino.h

uint16_t PROGMEM port_to_input_PGM const [] = {
NOT_A_PIN,
(uint16_t) & PINA,
(uint16_t) & PINB,
(uint16_t) & PINC,
(uint16_t) & PIND,
(uint16_t) & PINE,
(uint16_t) & PINF,
(uint16_t) & PING,
(uint16_t) & pinion,
NOT_A_PIN,
(uint16_t) & PINJ,
(uint16_t) & PINK,
(uint16_t) & pinl,
};

Generating a conflict with my constant PING. Now the strange thing is that it is set within a Namespace theoretically supposed to stay in another scope: