include avr/interrupt.h ,compile error

When I compile files that include a .cpp file in libraries, in that file 3rd line
#include <avr/interrupt.h>

The compiler gave me a error:
" D:\arduino-1.5.2\libraries\VarSpeedServoMaster\VarSpeedServo.cpp:71: fatal error: avr/interrupt.h: No such file or directory
compilation terminated."

How should I include this file?

Thank you in advance.

D:\arduino-1.5.2\libraries\VarSpeedServoMaster

VarSpeedServo is NOT a core library. It has no business in the core library folder. Try putting it where it belongs.

PaulS: D:\arduino-1.5.2\libraries\VarSpeedServoMaster

VarSpeedServo is NOT a core library. It has no business in the core library folder. Try putting it where it belongs.

Thank you Paul, where should I put the library files that not belong to core library file?

where should I put the library files that not belong to core library file?

In a folder in the libraries folder of your sketches folder.