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/usr/include/net-snmp/system/ultrix4.h is in libsnmp-dev 5.7.2~dfsg-8.1ubuntu3.

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#include <net-snmp/system/generic.h>
#include <sys/types.h>

typedef int     ssize_t;

#undef TCP_TTL_SYMBOL
#define TCP_TTL_SYMBOL "tcp_ttl"

#undef RTTABLES_SYMBOL