Software Seriel library not found in Aurduino due

I am doing a project with communication interface devices (Bluetooth module-HC-05). The issue is I need "Software Serial" library to compile the program. When I tried on other Arduino boards the library is available but not available to Arduino Due. Plz upload a "Software serial" library and plz tell me the instructions to properly import it into the software.I AM USING ARDUINO PC VERSION 1.6.5

The issue is I need "Software Serial" library to compile the program.

Why use SoftwareSerial when the Due has 4 hardware serial ports ? Are you using all 4 of them for something ?