Error if I using Audio Input with Arduino Mega

[Oggymator]

If I enable Audio Input with an Arduino Mega, I get the following error.
How can I solve it?

InOscCallback.ino: In function 'void oscCallbackAudio(OSCMessage*)':
InOscCallback:56: error: 'oscCallBackWorkarround' was not declared in this scope
InOscCallback:57: error: 'oscCallBackWorkarround' was not declared in this scope
InOscCallback:57: error: 'OSC_WORKARROUND_TIME' was not declared in this scope