AVRonly-adjustedRecieveOnlySoftwareSerial

No Arduino Dependencies, Adjust your Port Settings in the .cpp. The pin must be an interrupt pin

Usage:

  #include <ReceiveOnlySoftwareSerial.h>
   ReceiveOnlySoftwareSerial gpsSer;  // RX 

if (gpsSer.available()) {
 char c = gpsSer.read();
}