Ludovic Rousseau a57793fe5a Do not build pn532_spi if spi is not available
Check if the include file linux/spi/spidev.h is available and, only if
the header file is present, add the driver pn532_spi for "default" and
"all" driver configuration.

This Linux header file is not present on Mac OS X for example.
2013-04-03 16:08:34 +02:00
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