AC_CHECK_DECL([i2c_smbus_read_i2c_block_data],
[with_libi2c="yes"],
[with_libi2c="no (symbol i2c_smbus_read_i2c_block_data not found - have you installed libi2c-dev ?)"],
[[
#include <stdlib.h>
#include <linux/i2c-dev.h>
AC_CHECK_DECL([i2c_smbus_read_i2c_block_data],
[with_libi2c="yes"],
[with_libi2c="no (symbol i2c_smbus_read_i2c_block_data not found - have you installed libi2c-dev ?)"],
[[
#include <stdlib.h>
#include <linux/i2c-dev.h>