Hi Johnny, Yes. It seems to want <strings.h> 6.5.24 and above (or 6.5.29f in my case) was aiming at SUSv3 compliance away from base XPG4 so things were moved to strings.h (http://pubs.opengroup.org/onlinepubs/009695399/functions/index.html) .. it's also in the 3c index man page, you were right. So, compiles on IRIX 6.5.29 if the header is included. Worth gating it in via #ifdef ? I'm also a fan of enum types. Binary emitted is ~298kb. Also, your welcome to an account on the system if you wish to poke/play around, it's accessible over ssh and the general internet (it's my daily shell/hacking on code box). -Wall makes the MIPSpro runtime *extremely* chatty. It's quite anal. See below. Al. cc-3201 cc: REMARK File = bridge.c, Line = 158 The parameter "data" was never referenced. int lookup(struct sockaddr_in *sa, char *data) ^ cc-1506 cc: REMARK File = bridge.c, Line = 460 There is an implicit conversion from "unsigned long" to "long"; rounding, sign extension, or loss of accuracy may result. delta = timedelta(bridge[index].lasttime); ^ cc-3201 cc: REMARK File = bridge.c, Line = 559 The parameter "r" was never referenced. void dump_nomatch(struct sockaddr_in *r, struct DATA *d) ^ cc-3201 cc: REMARK File = bridge.c, Line = 559 The parameter "d" was never referenced. void dump_nomatch(struct sockaddr_in *r, struct DATA *d) ^ cc-1185 cc: WARNING File = bridge.c, Line = 579 An enumerated type is mixed with another type. d->type = classify_packet(d); ^ cc-1171 cc: WARNING File = bridge.c, Line = 685 The indicated expression has no effect. if (port == 0) port == DPORT; ^ cc-1498 cc: REMARK File = bridge.c, Line = 709 There is no prototype for the call to read_conf. read_conf(); ^ cc-1209 cc: REMARK File = bridge.c, Line = 715 The controlling expression is constant. while(1) { ^ jazz:~/src/HECnet[436]%