Software Serial in .cpp and .h files

Hey guys,

I'm trying to modify a gps library I found "GPS_MTK" to fit my needs.

It has the GPS hooked up via the hardware serial connection in the .cpp file of the library. What I need to do is edit it to make the GPS hookup to the software serial port instead. Apparently I need to define Softwareserial inside the class of the .h file as well as edit the .cpp file. Does anyone know how to incorporate Softwareserial into a header file? 

Have you tried

#include <SoftSerial.h> ?

The internet says i need to

The internet says i need to modify the class in the .h file?

http://stackoverflow.com/questions/13169714/creating-a-library-for-an-arduino