Added code to fallback to Yosemite or pre-Yosemite system font in case current system font can't be found or is in an unusable format. San Francisco font used on current OS X versions is in a .otf file whih presumably means it has CFF outlines that stb_truetype can't use.

#ifndef NET_H_
#define NET_H_
#include <stdint.h>

typedef struct {
	uint8_t ip[4];
	uint8_t net_mask[4];
} iface_info;

uint8_t get_host_address(iface_info *out);

#endif //NET_H_