How do I add multiple receivers to this Lib

Hi Guys the below link is for decoding RC5 IR signals. Earlier I was using ken sheriff IR library. But it is creating timer conflicts with my Ethernet code. Any how I just need to receive and decode RC5 IR signals only from 4 receivers. I made this to work for 1 receiver. How do I make it to work for 4 independent receivers ?[RC5_Decoder_V2](