>Casting the parameter to "(socklen_t*)" in all of the code using >SOCKLEN_T solves the problem Did you create your "Makefile"s using genMakefiles macosx ? If so, then you should get -DSOCKLEN_T=socklen_t on each compile line. Ross Finlayson Live Networks, Inc. (LIVE555.COM) <http://www.live555.com/>