1If you have trouble, try this suggestion from Peter Waltenberg: 2 3>> From peterw@dascom.com Mon Jul 13 22:32 EST 1998 4>> X-Priority: 3 (Normal) 5>> Date: Tue, 14 Jul 1998 08:31:57 +1000 (EST) 6>> Reply-To: peterw@dascom.com 7>> Organization: DASCOM 8>> Sender: peterw@mulga.surf.dascom.com 9>> From: Peter Waltenberg <peterw@dascom.com> 10>> To: Shawn Ostermann <sdo@picard.cs.ohiou.edu> 11>> Subject: Re: tcptrace 12>> 13>> On Linux with glibc-2 it needs 14>> 15>> DEFINES += -D_BSD_SOURCE 16>> 17>> to build properly. 18>> 19>> It's simply a matter of which "style" of tcphdr struct naming is 20>> pulled in from the include files. 21>> 22>> From memory the "-D_BSD_SOURCE" is safe for older Linux setups as 23>> well, however I can't test it. 24>> 25>> Peter 26