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The snprintf() function conforms to C99. On FreeBSD, sys/cdefs.h instruct us that _XOPEN_SOURCE == 500 defines _POSIX_C_SOURCE as 199506 which in turn defines __ISO_C_VISIBLE as 1990. 600 is the minimal _XOPEN_SOURCE value we can use to allow us using C99 functions. Reported by: tinderbox