bit banged SPI, pigpio C Interface, error?

Hallo,

ich versuche verzweifelt ein Programm zu kompilieren auf Basis vom 
Pigpio C Interface http://abyz.co.uk/rpi/pigpio/cif.html und Beispiel 
http://abyz.co.uk/rpi/pigpio/cif.html#bbSPIOpen siehe auch unten.

Ich kriege aber immer folgende Errors:

pi@raspberrypi:~ $ gcc -Wall -pthread -o bbSPIx_test bbSPIx_test.c 
-lpigpio
/tmp/ccQ7bgsH.o: In function `main':
bbSPIx_test.c:(.text+0x9c): undefined reference to `bbSPIOpen'
bbSPIx_test.c:(.text+0xc0): undefined reference to `bbSPIOpen'
bbSPIx_test.c:(.text+0xf4): undefined reference to `bbSPIXfer'
bbSPIx_test.c:(.text+0x120): undefined reference to `bbSPIXfer'
bbSPIx_test.c:(.text+0x154): undefined reference to `bbSPIXfer'
bbSPIx_test.c:(.text+0x1ac): undefined reference to `bbSPIClose'
bbSPIx_test.c:(.text+0x1b4): undefined reference to `bbSPIClose'
collect2: error: ld returned 1 exit status


Die Hardware SPI (spiXfer..) funktioniert einwandfrei auf meinem 
Raspberry pi 3 mit jessie. Wieso gehen die bit banged SPI Funktionen 
nicht?


Example

// gcc -Wall -pthread -o bbSPIx_test bbSPIx_test.c -lpigpio
// sudo ./bbSPIx_test

#include <stdio.h>

#include "pigpio.h"

#define CE0 5
#define CE1 6
#define MISO 13
#define MOSI 19
#define SCLK 12

int main(int argc, char *argv[])
{
   int i, count, set_val, read_val;
   unsigned char inBuf[3];
   char cmd1[] = {0, 0};
   char cmd2[] = {12, 0};
   char cmd3[] = {1, 128, 0};

   if (gpioInitialise() < 0)
   {
      fprintf(stderr, "pigpio initialisation failed.\n");
      return 1;
   }

   bbSPIOpen(CE0, MISO, MOSI, SCLK, 10000, 0); // MCP4251 DAC
   bbSPIOpen(CE1, MISO, MOSI, SCLK, 20000, 3); // MCP3008 ADC

   for (i=0; i<256; i++)
   {
      cmd1[1] = i;

      count = bbSPIXfer(CE0, cmd1, (char *)inBuf, 2); // > DAC

      if (count == 2)
      {
         count = bbSPIXfer(CE0, cmd2, (char *)inBuf, 2); // < DAC

         if (count == 2)
         {
            set_val = inBuf[1];

            count = bbSPIXfer(CE1, cmd3, (char *)inBuf, 3); // < ADC

            if (count == 3)
            {
               read_val = ((inBuf[1]&3)<<8) | inBuf[2];
               printf("%d %d\n", set_val, read_val);
            }
         }
      }
   }

   bbSPIClose(CE0);
   bbSPIClose(CE1);

   gpioTerminate();

   return 0;
}