build libnfc and detect nfc facility

build libnfc

1. clone from github

➜  utils git:(master) ✗  git clone https://github.com/nfc-tools/libnfc.git

2. config and make

 ➜  utils git:(master) ✗ autoreconf -vis
 ➜  utils git:(master) ✗ ./configure --prefix=/usr --sysconfdir=/etc
 ➜  utils git:(master) ✗  make
 ➜  utils git:(master) ✗  sudo make install

detect nfc facility

➜  utils git:(master) ✗  sudo nfc-list #will not find it
➜  utils git:(master) ✗  sudo LIBNFC_LOG_LEVEL=3 nfc-list 
info    libnfc.config   Unable to open file: /usr/local/etc/nfc/libnfc.conf
debug   libnfc.config   Unable to open directory: /usr/local/etc/nfc/devices.d
debug   libnfc.general  log_level is set to 3
debug   libnfc.general  allow_autoscan is set to true
debug   libnfc.general  allow_intrusive_scan is set to true
debug   libnfc.general  0 device(s) defined by user
nfc-scan-device uses libnfc libnfc-1.7.1-199-ga9af192
debug   libnfc.driver.arygon    Trying to find ARYGON device on serial port: /dev/ttyUSB0 at 9600 baud.
debug   libnfc.bus.uart Serial port speed requested to be set to 9600 baud.
...

so I create /usr/local/etc/nfc/libnfc.conf

device.name = "my-nfc-chip"
device.connstring = "pn532_uart:/dev/ttyUSB0"

then I use nfc-list

➜  utils git:(master) ✗ sudo nfc-list                          
nfc-list uses libnfc libnfc-1.7.1-199-ga9af192
NFC device: my-nfc-chip opened