OK, the fix worked for RPi2 just my receiver tricked me.

README

@@ -4,6 +4,8 @@ Makes a very simple WSPR beacon from your RasberryPi by connecting GPIO
 port to Antenna (and LPF), operates on LF, MF, HF and VHF bands from
 0 to 250 MHz.
 
+It is now compatible with both the original Raspberry Pi and Raspberry Pi 2.
+
 ******
 Installation / update:
 ******

wspr.cpp

@@ -18,6 +18,8 @@ License:
 
 */
 
+//ha7ilm: added RPi2 support based on a patch to PiFmRds by Cristophe Jacquet and Richard Hirst: http://git.io/vn7O9
+
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>