Raspberry Libnfc nfc-poll

Hi,

i want to connect two  Pn532 boards with the raspberry pi3. 

One board works with the raspberry and read the nfc-chip.

I checked allready in the terminal the connection with the command nfc-list.

pi@raspberrypi:~ $ nfc-list
nfc-list uses libnfc 1.7.1
NFC device: pn532_spi:/dev/spidev0.0 opened
NFC device: pn532_spi:/dev/spidev0.1 opened pi@raspberrypi:~ $ nfc-poll
nfc-poll uses libnfc 1.7.1
NFC reader: pn532_spi:/dev/spidev0.0 opened
NFC device will poll during 30000 ms (20 pollings of 300 ms for 5 modulations)
nfc_initiator_poll_target: Success

Now my questions:

1.how can i add the second board(spidev0.1) in the programm?

2.When i  change the nfc-poll.c file and try to compile it, i have every time this error.

pi@raspberrypi:~/libnfc-1.7.1/examples $ gcc nfc-poll.c
nfc-poll.c:57:29: fatal error: utils/nfc-utils.h: Datei oder Verzeichnis nicht gefunden
#include “utils/nfc-utils.h”
^
compilation terminated.

With kind regards 

Techniker567

that is the board:

https://www.amazon.de/Asiawill-auf-Board-Smartcard-kompatibel-Raspberry/dp/B00SVEAYF8/ref=sr_1_6?ie=UTF8&qid=1512243377&sr=8-6&keywords=pn532